diff --git a/.cirrus.yml b/.cirrus.yml
index 72e3a8d9..dfdf0d02 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -8,7 +8,7 @@ main_freebsd_task:
   name: Main (FreeBSD)
   only_if: $CIRRUS_BRANCH == 'master' || $CIRRUS_BASE_BRANCH == 'master'
   dependencies_script:
-    - pkg install --yes autoconf automake
+    - pkg install --yes autoconf automake libtool
   main_build_script:
     - ./autogen.sh
     - ./configure --enable-tests CFLAGS='-O3'
@@ -25,7 +25,7 @@ mruby_freebsd_task:
     LIBRARY_PATH: '/usr/local/lib'
     MRUBY_YAML_USE_SYSTEM_LIBRARY: x
   dependencies_script:
-    - pkg install --yes autoconf automake git rubygem-rake wget
+    - pkg install --yes autoconf automake git libtool rubygem-rake wget
   dependencies_mruby_script:
     - wget https://github.com/mruby/mruby/archive/3.1.0.zip -O mruby-3.1.0.zip
     - unzip mruby-3.1.0.zip
@@ -45,7 +45,7 @@ ruby_freebsd_task:
     CPATH: '/usr/local/include'
     LIBRARY_PATH: '/usr/local/lib'
   dependencies_script:
-    - pkg install --yes autoconf automake git wget
+    - pkg install --yes autoconf automake git libtool wget
   dependencies_ruby_script:
     - wget https://cache.ruby-lang.org/pub/ruby/3.0/ruby-3.0.3.tar.gz
     - tar -xzf ruby-3.0.3.tar.gz
@@ -72,7 +72,7 @@ rust_freebsd_task:
   env:
     RUSTFLAGS: '-L /usr/local/lib'
   dependencies_script:
-    - pkg install --yes autoconf automake
+    - pkg install --yes autoconf automake libtool
   dependencies_rust_script:
     - curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
   main_build_script:
diff --git a/.gitignore b/.gitignore
index e4aa9293..25e66a34 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,10 +4,13 @@
 
 *.a
 *.c.d
+*.la
+*.lo
 *.o
 
 .deps/
 .dirstamp
+.libs/
 
 ############################
 # Always generated in root #
@@ -28,14 +31,17 @@
 /configure~
 /depcomp
 /install-sh
+/ltmain.sh
 /missing
 /test-driver
 
+/m4/*
+!/m4/.keep
+
 # Custom
 
 /Makefile.in
 /include/Makefile.in
-/libc/include/Makefile.in
 
 ########################
 # To build out of root #
@@ -79,6 +85,7 @@
 /config.h
 /config.log
 /config.status
+/libtool
 /stamp-h1
 /test-suite.log
 
@@ -91,7 +98,6 @@
 
 /Makefile
 /include/Makefile
-/libc/include/Makefile
 
 /include/kernaux.h
 /include/kernaux/console.h
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3873f270..d18beea5 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -2,8 +2,8 @@ Common
 ------
 
 * Add your name to [COPYING](/COPYING).
-* If you change the behavior (even just fix a bug) of **core** or of
-  [libc](/libc), add a record to [ChangeLog](/ChangeLog). 
+* If you change the behavior (even just fix a bug) of **libkernaux**,
+  [libc](/libc) or [libm](/libm), add a record to [ChangeLog](/ChangeLog).
 
 
 
diff --git a/Makefile.am b/Makefile.am
index e5dd2032..93794f53 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,85 +1,65 @@
-##########
-# Common #
-##########
+# FIXME: dependencies are not built automatically with --enable-split-*
 
-SUBDIRS = include libc/include
+include $(top_srcdir)/shared.am
 
-CLEANFILES =
-TESTS =
+ACLOCAL_AMFLAGS = -I m4
+EXTRA_DIST = autogen.sh CONTRIBUTING.md sha256sums.txt
 
-AM_CFLAGS = \
-	-std=c99 \
-	-pedantic \
-	-Wall \
-	-Wextra \
-	-I$(top_builddir)/include \
-	-I$(top_srcdir)/include \
-	-D_POSIX_C_SOURCE=200809L
+SUBDIRS = include
 
 if WITH_LIBC
-AM_CFLAGS += \
-	-I$(top_builddir)/libc/include \
-	-I$(top_srcdir)/libc/include
+SUBDIRS += libc
+endif
+if WITH_LIBM
+SUBDIRS += libm
 endif
 
-if ENABLE_WERROR
-AM_CFLAGS += -Werror
+SUBDIRS += .
+
+if ENABLE_TESTS
+SUBDIRS += examples tests
 endif
 
-# TODO: DRY (configure.ac)
-if ENABLE_FREESTANDING
-AM_CFLAGS += -nostdlib -ffreestanding -fno-pic -fno-stack-protector
-else
-AM_CFLAGS += -fpic
-endif
+lib_LTLIBRARIES = libkernaux.la
 
-#######
-# all #
-#######
+libkernaux_la_SOURCES = src/libc.h src/assert.c
+libkernaux_la_LIBADD =
 
-lib_LIBRARIES = libkernaux.a
-noinst_PROGRAMS = $(TESTS)
-
-################
-# libkernaux.a #
-################
-
-libkernaux_a_SOURCES = src/libc.h src/assert.c
 if ASM_I386
-libkernaux_a_SOURCES += src/asm/i386.S
+libkernaux_la_SOURCES += src/asm/i386.S
 endif
 if ASM_RISCV64
-libkernaux_a_SOURCES += src/asm/riscv64.S
+libkernaux_la_SOURCES += src/asm/riscv64.S
 endif
 if ASM_X86_64
-libkernaux_a_SOURCES += src/asm/x86_64.S
+libkernaux_la_SOURCES += src/asm/x86_64.S
 endif
 if WITH_CMDLINE
-libkernaux_a_SOURCES += src/cmdline.c
+libkernaux_la_SOURCES += src/cmdline.c
 endif
 if WITH_CONSOLE
-libkernaux_a_SOURCES += src/console.c
+libkernaux_la_SOURCES += src/console.c
 endif
 if WITH_ELF
-libkernaux_a_SOURCES += src/elf.c
+libkernaux_la_SOURCES += src/elf.c
 endif
 if WITH_FILE
-libkernaux_a_SOURCES += src/file.c
+libkernaux_la_SOURCES += src/file.c
 endif
 if WITH_FRAMEBUFFER
-libkernaux_a_SOURCES += src/framebuffer.c
+libkernaux_la_SOURCES += src/framebuffer.c
 endif
 if WITH_LIBC
-libkernaux_a_SOURCES += \
-	libc/src/ctype.c \
-	libc/src/stdlib.c \
-	libc/src/string.c
+libkernaux_la_LIBADD += libc/libc.la
+endif
+if WITH_LIBM
+libkernaux_la_LIBADD += libm/libm.la
 endif
 if WITH_MBR
-libkernaux_a_SOURCES += src/mbr.c
+libkernaux_la_SOURCES += src/mbr.c
 endif
 if WITH_MULTIBOOT2
-libkernaux_a_SOURCES += \
+libkernaux_la_SOURCES += \
 	src/multiboot2/enums_to_str.c \
 	src/multiboot2/header_helpers.c \
 	src/multiboot2/header_is_valid.c \
@@ -89,465 +69,17 @@ libkernaux_a_SOURCES += \
 	src/multiboot2/info_print.c
 endif
 if WITH_NTOA
-libkernaux_a_SOURCES += src/ntoa.c
+libkernaux_la_SOURCES += src/ntoa.c
 endif
 if WITH_PFA
-libkernaux_a_SOURCES += src/pfa.c
+libkernaux_la_SOURCES += src/pfa.c
 endif
 if WITH_PRINTF
-libkernaux_a_SOURCES += src/printf.c
+libkernaux_la_SOURCES += src/printf.c
 endif
 if WITH_PRINTF_FMT
-libkernaux_a_SOURCES += src/printf_fmt.c
+libkernaux_la_SOURCES += src/printf_fmt.c
 endif
 if WITH_UNITS
-libkernaux_a_SOURCES += src/units.c
-endif
-
-##########################
-# examples/assert_guards #
-##########################
-
-if ENABLE_TESTS
-TESTS += examples/assert_guards
-examples_assert_guards_LDADD = libkernaux.a
-examples_assert_guards_SOURCES = examples/assert_guards.c
-endif
-
-##########################
-# examples/assert_simple #
-##########################
-
-if ENABLE_TESTS
-TESTS += examples/assert_simple
-examples_assert_simple_LDADD = libkernaux.a
-examples_assert_simple_SOURCES = examples/assert_simple.c
-endif
-
-####################
-# examples/cmdline #
-####################
-
-if ENABLE_TESTS
-if WITH_CMDLINE
-TESTS += examples/cmdline
-examples_cmdline_LDADD = libkernaux.a
-examples_cmdline_SOURCES = examples/cmdline.c
-endif
-endif
-
-####################
-# examples/fprintf #
-####################
-
-if ENABLE_TESTS
-if WITH_PRINTF
-if WITH_FILE
-TESTS += examples/fprintf
-examples_fprintf_LDADD = libkernaux.a
-examples_fprintf_SOURCES = examples/fprintf.c
-endif
-endif
-endif
-
-#######################
-# examples/fprintf_va #
-#######################
-
-if ENABLE_TESTS
-if WITH_PRINTF
-if WITH_FILE
-TESTS += examples/fprintf_va
-examples_fprintf_va_LDADD = libkernaux.a
-examples_fprintf_va_SOURCES = examples/fprintf_va.c
-endif
-endif
-endif
-
-#################
-# examples/ntoa #
-#################
-
-if ENABLE_TESTS
-if WITH_NTOA
-TESTS += examples/ntoa
-examples_ntoa_LDADD = libkernaux.a
-examples_ntoa_SOURCES = examples/ntoa.c
-endif
-endif
-
-#########################
-# examples/panic_guards #
-#########################
-
-if ENABLE_TESTS
-TESTS += examples/panic_guards
-examples_panic_guards_LDADD = libkernaux.a
-examples_panic_guards_SOURCES = examples/panic_guards.c
-endif
-
-#########################
-# examples/panic_simple #
-#########################
-
-if ENABLE_TESTS
-TESTS += examples/panic_simple
-examples_panic_simple_LDADD = libkernaux.a
-examples_panic_simple_SOURCES = examples/panic_simple.c
-endif
-
-################
-# examples/pfa #
-################
-
-if ENABLE_TESTS
-if WITH_PFA
-TESTS += examples/pfa
-examples_pfa_LDADD = libkernaux.a
-examples_pfa_SOURCES = examples/pfa.c
-endif
-endif
-
-#######################
-# examples/printf_fmt #
-#######################
-
-if ENABLE_TESTS
-if WITH_PRINTF_FMT
-TESTS += examples/printf_fmt
-examples_printf_fmt_LDADD = libkernaux.a
-examples_printf_fmt_SOURCES = examples/printf_fmt.c
-endif
-endif
-
-#####################
-# examples/snprintf #
-#####################
-
-if ENABLE_TESTS
-if WITH_PRINTF
-TESTS += examples/snprintf
-examples_snprintf_LDADD = libkernaux.a
-examples_snprintf_SOURCES = examples/snprintf.c
-endif
-endif
-
-########################
-# examples/snprintf_va #
-########################
-
-if ENABLE_TESTS
-if WITH_PRINTF
-TESTS += examples/snprintf_va
-examples_snprintf_va_LDADD = libkernaux.a
-examples_snprintf_va_SOURCES = examples/snprintf_va.c
-endif
-endif
-
-########################
-# examples/units_human #
-########################
-
-if ENABLE_TESTS
-if WITH_UNITS
-TESTS += examples/units_human
-examples_units_human_LDADD = libkernaux.a
-examples_units_human_SOURCES = examples/units_human.c
-endif
-endif
-
-##################################
-# tests/multiboot2_header_print1 #
-##################################
-
-if ENABLE_TESTS
-if WITH_MULTIBOOT2
-noinst_PROGRAMS += tests/multiboot2_header_print1
-tests_multiboot2_header_print1_LDADD = libkernaux.a
-tests_multiboot2_header_print1_SOURCES = \
-	tests/multiboot2_header_print1.c \
-	tests/multiboot2_header_example1.h
-endif
-endif
-
-##################################
-# tests/multiboot2_header_print2 #
-##################################
-
-if ENABLE_TESTS
-if WITH_MULTIBOOT2
-noinst_PROGRAMS += tests/multiboot2_header_print2
-tests_multiboot2_header_print2_LDADD = libkernaux.a
-tests_multiboot2_header_print2_SOURCES = \
-	tests/multiboot2_header_print2.c \
-	tests/multiboot2_header_example2.h
-endif
-endif
-
-################################
-# tests/multiboot2_info_print1 #
-################################
-
-if ENABLE_TESTS
-if WITH_MULTIBOOT2
-noinst_PROGRAMS += tests/multiboot2_info_print1
-tests_multiboot2_info_print1_LDADD = libkernaux.a
-tests_multiboot2_info_print1_SOURCES = \
-	tests/multiboot2_info_print1.c \
-	tests/multiboot2_info_example1.h
-endif
-endif
-
-################################
-# tests/multiboot2_info_print2 #
-################################
-
-if ENABLE_TESTS
-if WITH_MULTIBOOT2
-noinst_PROGRAMS += tests/multiboot2_info_print2
-tests_multiboot2_info_print2_LDADD = libkernaux.a
-tests_multiboot2_info_print2_SOURCES = \
-	tests/multiboot2_info_print2.c \
-	tests/multiboot2_info_example2.h
-endif
-endif
-
-######################
-# tests/test_cmdline #
-######################
-
-if ENABLE_TESTS
-if WITH_CMDLINE
-TESTS += tests/test_cmdline
-tests_test_cmdline_LDADD = libkernaux.a
-tests_test_cmdline_SOURCES = tests/test_cmdline.c
-endif
-endif
-
-##########################
-# tests/test_cmdline_gen #
-##########################
-
-if ENABLE_TESTS_PYTHON
-if WITH_CMDLINE
-TESTS += tests/test_cmdline_gen
-tests_test_cmdline_gen_LDADD = libkernaux.a
-tests_test_cmdline_gen_SOURCES = \
-	tests/test_cmdline_gen.c \
-	tests/cmdline_gen.py \
-	tests/cmdline_gen.jinja \
-	common/cmdline.yml
-endif
-endif
-
-CLEANFILES += tests/test_cmdline_gen.c
-
-tests/test_cmdline_gen.c: tests/cmdline_gen.py tests/cmdline_gen.jinja common/cmdline.yml
-	python3 tests/cmdline_gen.py
-
-##################
-# tests/test_elf #
-##################
-
-if ENABLE_TESTS
-if WITH_ELF
-TESTS += tests/test_elf
-tests_test_elf_LDADD = libkernaux.a
-tests_test_elf_SOURCES = tests/test_elf.c
-endif
-endif
-
-##################
-# tests/test_mbr #
-##################
-
-if ENABLE_TESTS
-if WITH_MBR
-TESTS += tests/test_mbr
-tests_test_mbr_LDADD = libkernaux.a
-tests_test_mbr_SOURCES = tests/test_mbr.c
-endif
-endif
-
-########################################
-# tests/test_multiboot2_header_helpers #
-########################################
-
-if ENABLE_TESTS
-if WITH_MULTIBOOT2
-TESTS += tests/test_multiboot2_header_helpers
-tests_test_multiboot2_header_helpers_LDADD = libkernaux.a
-tests_test_multiboot2_header_helpers_SOURCES = \
-	tests/test_multiboot2_header_helpers.c \
-	tests/multiboot2_header_example1.h \
-	tests/multiboot2_header_example2.h
-endif
-endif
-
-######################################
-# tests/test_multiboot2_header_print #
-######################################
-
-if ENABLE_TESTS
-if WITH_MULTIBOOT2
-TESTS += tests/test_multiboot2_header_print
-tests_test_multiboot2_header_print_DEPENDENCIES = \
-	tests/multiboot2_header_print1 \
-	tests/multiboot2_header_print2
-tests_test_multiboot2_header_print_LDADD = libkernaux.a
-tests_test_multiboot2_header_print_SOURCES = \
-	tests/test_multiboot2_header_print.c
-endif
-endif
-
-###########################################
-# tests/test_multiboot2_header_validation #
-###########################################
-
-if ENABLE_TESTS
-if WITH_MULTIBOOT2
-TESTS += tests/test_multiboot2_header_validation
-tests_test_multiboot2_header_validation_LDADD = libkernaux.a
-tests_test_multiboot2_header_validation_SOURCES = \
-	tests/test_multiboot2_header_validation.c \
-	tests/multiboot2_header_example1.h \
-	tests/multiboot2_header_example2.h
-endif
-endif
-
-######################################
-# tests/test_multiboot2_info_helpers #
-######################################
-
-if ENABLE_TESTS
-if WITH_MULTIBOOT2
-TESTS += tests/test_multiboot2_info_helpers
-tests_test_multiboot2_info_helpers_LDADD = libkernaux.a
-tests_test_multiboot2_info_helpers_SOURCES = \
-	tests/test_multiboot2_info_helpers.c \
-	tests/multiboot2_info_example1.h \
-	tests/multiboot2_info_example2.h
-endif
-endif
-
-####################################
-# tests/test_multiboot2_info_print #
-####################################
-
-if ENABLE_TESTS
-if WITH_MULTIBOOT2
-TESTS += tests/test_multiboot2_info_print
-tests_test_multiboot2_info_print_DEPENDENCIES = \
-	tests/multiboot2_info_print1 \
-	tests/multiboot2_info_print2
-tests_test_multiboot2_info_print_LDADD = libkernaux.a
-tests_test_multiboot2_info_print_SOURCES = \
-	tests/test_multiboot2_info_print.c
-endif
-endif
-
-#########################################
-# tests/test_multiboot2_info_validation #
-#########################################
-
-if ENABLE_TESTS
-if WITH_MULTIBOOT2
-TESTS += tests/test_multiboot2_info_validation
-tests_test_multiboot2_info_validation_LDADD = libkernaux.a
-tests_test_multiboot2_info_validation_SOURCES = \
-	tests/test_multiboot2_info_validation.c \
-	tests/multiboot2_info_example1.h \
-	tests/multiboot2_info_example2.h
-endif
-endif
-
-###################
-# tests/test_ntoa #
-###################
-
-if ENABLE_TESTS
-if WITH_NTOA
-TESTS += tests/test_ntoa
-tests_test_ntoa_LDADD = libkernaux.a
-tests_test_ntoa_SOURCES = tests/test_ntoa.c
-endif
-endif
-
-##################
-# tests/test_pfa #
-##################
-
-if ENABLE_TESTS
-if WITH_PFA
-TESTS += tests/test_pfa
-tests_test_pfa_LDADD = libkernaux.a
-tests_test_pfa_SOURCES = tests/test_pfa.c
-endif
-endif
-
-#########################
-# tests/test_pfa_assert #
-#########################
-
-if ENABLE_TESTS
-if WITH_PFA
-TESTS += tests/test_pfa_assert
-tests_test_pfa_assert_LDADD = libkernaux.a
-tests_test_pfa_assert_SOURCES = tests/test_pfa_assert.c
-endif
-endif
-
-#############################
-# tests/test_printf_fmt_gen #
-#############################
-
-if ENABLE_TESTS_PYTHON
-if WITH_PRINTF_FMT
-TESTS += tests/test_printf_fmt_gen
-tests_test_printf_fmt_gen_LDADD = libkernaux.a
-tests_test_printf_fmt_gen_SOURCES = \
-	tests/test_printf_fmt_gen.c \
-	tests/printf_fmt_gen.py \
-	tests/printf_fmt_gen.jinja \
-	common/printf_fmt.yml
-endif
-endif
-
-CLEANFILES += tests/test_printf_fmt_gen.c
-
-tests/test_printf_fmt_gen.c: tests/printf_fmt_gen.py tests/printf_fmt_gen.jinja common/printf_fmt.yml
-	python3 tests/printf_fmt_gen.py
-
-#########################
-# tests/test_printf_gen #
-#########################
-
-if ENABLE_TESTS_PYTHON
-if WITH_PRINTF
-TESTS += tests/test_printf_gen
-tests_test_printf_gen_LDADD = libkernaux.a
-tests_test_printf_gen_SOURCES = \
-	tests/test_printf_gen.c \
-	tests/printf_gen.py \
-	tests/printf_gen.jinja \
-	common/printf.yml \
-	common/printf_orig.yml
-endif
-endif
-
-CLEANFILES += tests/test_printf_gen.c
-
-tests/test_printf_gen.c: tests/printf_gen.py tests/printf_gen.jinja common/printf.yml common/printf_orig.yml
-	python3 tests/printf_gen.py
-
-##########################
-# tests/test_units_human #
-##########################
-
-if ENABLE_TESTS
-if WITH_UNITS
-TESTS += tests/test_units_human
-tests_test_units_human_LDADD = libkernaux.a
-tests_test_units_human_SOURCES = tests/test_units_human.c
-endif
+libkernaux_la_SOURCES += src/units.c
 endif
diff --git a/README.md b/README.md
index 6c6a73b9..0af3029d 100644
--- a/README.md
+++ b/README.md
@@ -76,6 +76,7 @@ zero). Work-in-progress APIs can change at any time.
     * [vsnprintf](/examples/snprintf_va.c)
 * libc replacement
   * [ctype.h](/libc/include/ctype.h)
+  * [math.h](/libm/include/math.h)
   * [stdlib.h](/libc/include/stdlib.h)
   * [string.h](/libc/include/string.h)
 
@@ -95,6 +96,9 @@ stable options.
 #### Features
 
 * `--enable-freestanding` - build for freestanding environment
+* `--enable-split-all` - split off all libraries
+* `--enable-split-libc` - split off libc
+* `--enable-split-libm` - split off libm
 * `--enable-tests` - enable usual tests and examples
 * `--enable-tests-all` - enable all tests
 * `--enable-tests-python` - enable tests that require Python 3 with YAML and
@@ -104,6 +108,8 @@ stable options.
 
 * `--with-libc` - provides the replacement for some standard C functions.
   Useful in freestanding environment, where no libc is present.
+* `--with-libm` - provides the replacement for C functions from `<math.h>`,
+  Useful in freestanding environment, where no libm is present.
 
 ### Default options
 
@@ -162,6 +168,7 @@ without it in `$PATH`:
   --host='i386-elf' \
   --enable-freestanding \
   --with-libc \
+  --with-libm \
   AR="$(which i386-elf-ar)" \
   CC="$(which i386-elf-gcc)" \
   RANLIB="$(which i386-elf-ranlib)"
diff --git a/config/dev-cross-i386 b/config/dev-cross-i386
index 70ecef7c..c6767e99 100755
--- a/config/dev-cross-i386
+++ b/config/dev-cross-i386
@@ -14,4 +14,4 @@ export     AR="$CROSS-ar"
 export     CC="$CROSS-gcc"
 export RANLIB="$CROSS-ranlib"
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc --with-libm
diff --git a/config/dev-cross-riscv64 b/config/dev-cross-riscv64
index 57b29fff..b1d62fba 100755
--- a/config/dev-cross-riscv64
+++ b/config/dev-cross-riscv64
@@ -14,4 +14,4 @@ export     AR="$CROSS-ar"
 export     CC="$CROSS-gcc"
 export RANLIB="$CROSS-ranlib"
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc --with-libm
diff --git a/config/dev-cross-x86_64 b/config/dev-cross-x86_64
index 4a900b6d..6d0df181 100755
--- a/config/dev-cross-x86_64
+++ b/config/dev-cross-x86_64
@@ -16,4 +16,4 @@ export RANLIB="$CROSS-ranlib"
 
 export CFLAGS='-mabi=sysv -mcmodel=kernel -mno-80387 -mno-red-zone'
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc --with-libm
diff --git a/config/root-cross-i386-linux b/config/root-cross-i386-linux
index 7740099b..549fd735 100755
--- a/config/root-cross-i386-linux
+++ b/config/root-cross-i386-linux
@@ -14,4 +14,4 @@ export     AR="$TARGET-ar"
 export     CC="$TARGET-gcc"
 export RANLIB="$TARGET-ranlib"
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc --with-libm
diff --git a/config/root-cross-riscv64-linux b/config/root-cross-riscv64-linux
index af99c56d..a5a4c264 100755
--- a/config/root-cross-riscv64-linux
+++ b/config/root-cross-riscv64-linux
@@ -14,4 +14,4 @@ export     AR="$TARGET-ar"
 export     CC="$TARGET-gcc"
 export RANLIB="$TARGET-ranlib"
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc --with-libm
diff --git a/config/root-cross-x86_64-linux b/config/root-cross-x86_64-linux
index 5d8fd627..4366263b 100755
--- a/config/root-cross-x86_64-linux
+++ b/config/root-cross-x86_64-linux
@@ -16,4 +16,4 @@ export RANLIB="$TARGET-ranlib"
 
 export CFLAGS='-mabi=sysv -mcmodel=kernel -mno-80387 -mno-red-zone'
 
-"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc
+"$REPO/configure" --host="$HOST" --prefix="$PREFIX" --enable-freestanding --with-libc --with-libm
diff --git a/configure.ac b/configure.ac
index 81e2d124..c03a3cc0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,16 +1,42 @@
+############################
+# Specify program versions #
+############################
+
 AC_PREREQ([2.68])
+LT_PREREQ([2.4.6])
+
+
+
+#######################
+# Initialize Autoconf #
+#######################
+
 AC_INIT([libkernaux],
   [0.3.0],
   [https://github.com/tailix/libkernaux/issues],
   [libkernaux],
   [https://github.com/tailix/libkernaux])
 
-AC_CONFIG_HEADERS([config.h])
-AC_CONFIG_SRCDIR([src/assert.c])
-
 AC_CANONICAL_BUILD
 AC_CANONICAL_HOST
 
+AC_CONFIG_MACRO_DIRS([m4])
+AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_SRCDIR([src/assert.c])
+AC_CONFIG_FILES([
+  Makefile
+  examples/Makefile
+  include/Makefile
+  libc/Makefile
+  libc/include/Makefile
+  libm/Makefile
+  libm/include/Makefile
+  include/kernaux.h
+  include/kernaux/console.h
+  include/kernaux/printf.h
+  tests/Makefile
+])
+
 
 
 ###############
@@ -23,6 +49,9 @@ AC_ARG_ENABLE([werror],       AS_HELP_STRING([--disable-werror],      [disable -
 
 dnl Features (disabled by default)
 AC_ARG_ENABLE([freestanding], AS_HELP_STRING([--enable-freestanding], [build for freestanding environment]))
+AC_ARG_ENABLE([split-all],    AS_HELP_STRING([--enable-split-all],    [split off all libraries]))
+AC_ARG_ENABLE([split-libc],   AS_HELP_STRING([--enable-split-libc],   [split off libc]))
+AC_ARG_ENABLE([split-libm],   AS_HELP_STRING([--enable-split-libm],   [split off libm]))
 AC_ARG_ENABLE([tests],        AS_HELP_STRING([--enable-tests],        [enable usual tests and examples]))
 AC_ARG_ENABLE([tests-all],    AS_HELP_STRING([--enable-tests-all],    [enable all tests]))
 AC_ARG_ENABLE([tests-python], AS_HELP_STRING([--enable-tests-python], [enable tests that require Python 3 with YAML and Jinja2]))
@@ -44,6 +73,7 @@ AC_ARG_WITH(  [units],        AS_HELP_STRING([--without-units],       [without m
 
 dnl Packages (disabled by default)
 AC_ARG_WITH(  [libc],         AS_HELP_STRING([--with-libc],           [with libc replacement]))
+AC_ARG_WITH(  [libm],         AS_HELP_STRING([--with-libm],           [with libm replacement]))
 
 
 
@@ -51,6 +81,13 @@ AC_ARG_WITH(  [libc],         AS_HELP_STRING([--with-libc],           [with libc
 # Default args #
 ################
 
+AC_DEFUN([do_enable_split_all],
+[
+if test -z "$enable_split_libc"; then enable_split_libc=yes; fi
+if test -z "$enable_split_libm"; then enable_split_libm=yes; fi
+])
+AS_IF([test "$enable_split_all" = yes], do_enable_split_all)
+
 AC_DEFUN([do_enable_tests_all],
 [
 if test -z "$enable_tests";        then enable_tests=yes;        fi
@@ -87,6 +124,9 @@ AS_IF([test "$enable_werror"       = no ], [enable_werror=no],        [enable_we
 
 dnl Features (disabled by default)
 AS_IF([test "$enable_freestanding" = yes], [enable_freestanding=yes], [enable_freestanding=no])
+AS_IF([test "$enable_split_all"    = yes], [enable_split_all=yes],    [enable_split_all=no])
+AS_IF([test "$enable_split_libc"   = yes], [enable_split_libc=yes],   [enable_split_libc=no])
+AS_IF([test "$enable_split_libm"   = yes], [enable_split_libm=yes],   [enable_split_libm=no])
 AS_IF([test "$enable_tests"        = yes], [enable_tests=yes],        [enable_tests=no])
 AS_IF([test "$enable_tests_all"    = yes], [enable_tests_all=yes],    [enable_tests_all=no])
 AS_IF([test "$enable_tests_python" = yes], [enable_tests_python=yes], [enable_tests_python=no])
@@ -108,6 +148,7 @@ AS_IF([test "$with_units"          = no ], [with_units=no],           [with_unit
 
 dnl Packages (disabled by default)
 AS_IF([test "$with_libc"           = yes], [with_libc=yes],           [with_libc=no])
+AS_IF([test "$with_libm"           = yes], [with_libm=yes],           [with_libm=no])
 
 
 
@@ -121,6 +162,8 @@ AS_IF([test "$enable_tests"        = yes -a "$enable_freestanding" = yes], AC_MS
 AS_IF([test "$enable_tests_python" = yes -a "$enable_freestanding" = yes], AC_MSG_ERROR([can not build freestanding tests]))
 AS_IF([test "$enable_tests"        = yes -a "$with_libc"           = yes], AC_MSG_ERROR([can not use package `libc' with tests]))
 AS_IF([test "$enable_tests_python" = yes -a "$with_libc"           = yes], AC_MSG_ERROR([can not use package `libc' with tests]))
+AS_IF([test "$enable_tests"        = yes -a "$with_libm"           = yes], AC_MSG_ERROR([can not use package `libm' with tests]))
+AS_IF([test "$enable_tests_python" = yes -a "$with_libm"           = yes], AC_MSG_ERROR([can not use package `libm' with tests]))
 
 AS_IF([test "$with_printf" = yes -a "$with_ntoa"       = no], AC_MSG_ERROR([package `printf' requires package `ntoa']))
 AS_IF([test "$with_printf" = yes -a "$with_printf_fmt" = no], AC_MSG_ERROR([package `printf' requires package `printf-fmt']))
@@ -143,6 +186,8 @@ AM_CONDITIONAL([ENABLE_WERROR],       [test "$enable_werror"       = yes])
 
 dnl Features (disabled by default)
 AM_CONDITIONAL([ENABLE_FREESTANDING], [test "$enable_freestanding" = yes])
+AM_CONDITIONAL([ENABLE_SPLIT_LIBC],   [test "$enable_split_libc"   = yes])
+AM_CONDITIONAL([ENABLE_SPLIT_LIBM],   [test "$enable_split_libm"   = yes])
 AM_CONDITIONAL([ENABLE_TESTS],        [test "$enable_tests"        = yes])
 AM_CONDITIONAL([ENABLE_TESTS_PYTHON], [test "$enable_tests_python" = yes])
 
@@ -162,6 +207,7 @@ AM_CONDITIONAL([WITH_UNITS],          [test "$with_units"          = yes])
 
 dnl Packages (disabled by default)
 AM_CONDITIONAL([WITH_LIBC],           [test "$with_libc"           = yes])
+AM_CONDITIONAL([WITH_LIBM],           [test "$with_libm"           = yes])
 
 
 
@@ -179,6 +225,8 @@ AS_IF([test "$enable_float"        = yes], [AC_DEFINE([ENABLE_FLOAT],        [1]
 AS_IF([test "$enable_werror"       = yes], [AC_DEFINE([ENABLE_WERROR],       [1], [enabled -Werror])])
 
 dnl Features (disabled by default)
+AS_IF([test "$enable_split_libc"   = yes], [AC_DEFINE([ENABLE_SPLIT_LIBC],   [1], [split off libc])])
+AS_IF([test "$enable_split_libm"   = yes], [AC_DEFINE([ENABLE_SPLIT_LIBM],   [1], [split off libm])])
 AS_IF([test "$enable_freestanding" = yes], [AC_DEFINE([ENABLE_FREESTANDING], [1], [build for freestanding environment])])
 AS_IF([test "$enable_tests"        = yes], [AC_DEFINE([ENABLE_TESTS],        [1], [enabled usual tests and examples])])
 AS_IF([test "$enable_tests_python" = yes], [AC_DEFINE([ENABLE_TESTS_PYTHON], [1], [enabled tests that require Python 3 with YAML and Jinja2])])
@@ -198,7 +246,8 @@ AS_IF([test "$with_printf_fmt"     = yes], [AC_DEFINE([WITH_PRINTF_FMT],     [1]
 AS_IF([test "$with_units",         = yes], [AC_DEFINE([WITH_UNITS],          [1], [with measurement units utils])])
 
 dnl Packages (disabled by default)
-AS_IF([test "$with_libc"           = yes], [AC_DEFINE([WITH_LIBC],           [1], [with atoi replacement])])
+AS_IF([test "$with_libc"           = yes], [AC_DEFINE([WITH_LIBC],           [1], [with libc replacement])])
+AS_IF([test "$with_libm"           = yes], [AC_DEFINE([WITH_LIBM],           [1], [with libm replacement])])
 
 
 
@@ -222,22 +271,27 @@ AS_IF([test "$with_units"        = no], [AC_SUBST([comment_line_units],        [
 
 
 
+###################
+# Set build flags #
+###################
+
 AC_DEFUN([do_enable_freestanding],  [CFLAGS+=' -nostdlib -ffreestanding -fno-pic -fno-stack-protector '])
 AC_DEFUN([do_disable_freestanding], [CFLAGS+=' -fpic '])
 AS_IF([test "$enable_freestanding" = yes], do_enable_freestanding, do_disable_freestanding)
 
 
 
+#######################
+# Initialize Automake #
+#######################
+
 AM_INIT_AUTOMAKE([1.16 subdir-objects])
 
-AC_CONFIG_FILES([
-  Makefile
-  include/Makefile
-  libc/include/Makefile
-  include/kernaux.h
-  include/kernaux/console.h
-  include/kernaux/printf.h
-])
+
+
+##############
+# Run checks #
+##############
 
 AC_LANG([C])
 
@@ -245,9 +299,22 @@ AM_PROG_AR
 AM_PROG_AS
 AC_PROG_CC
 AC_PROG_CC_C99
-AC_PROG_RANLIB
 AC_C_INLINE
 AC_CHECK_HEADER_STDBOOL
 AC_CHECK_HEADERS([stdarg.h stddef.h stdint.h])
 
+
+
+######################
+# Initialize Libtool #
+######################
+
+LT_INIT([disable-shared])
+
+
+
+##########
+# Finish #
+##########
+
 AC_OUTPUT
diff --git a/examples/.gitignore b/examples/.gitignore
new file mode 100644
index 00000000..b336cc7c
--- /dev/null
+++ b/examples/.gitignore
@@ -0,0 +1,2 @@
+/Makefile
+/Makefile.in
diff --git a/examples/Makefile.am b/examples/Makefile.am
new file mode 100644
index 00000000..d77dc548
--- /dev/null
+++ b/examples/Makefile.am
@@ -0,0 +1,130 @@
+include $(top_srcdir)/shared.am
+
+TESTS =
+noinst_PROGRAMS = $(TESTS)
+
+#################
+# assert_guards #
+#################
+
+TESTS += assert_guards
+assert_guards_LDADD = $(top_builddir)/libkernaux.la
+assert_guards_SOURCES = assert_guards.c
+
+#################
+# assert_simple #
+#################
+
+TESTS += assert_simple
+assert_simple_LDADD = $(top_builddir)/libkernaux.la
+assert_simple_SOURCES = assert_simple.c
+
+###########
+# cmdline #
+###########
+
+if WITH_CMDLINE
+TESTS += cmdline
+cmdline_LDADD = $(top_builddir)/libkernaux.la
+cmdline_SOURCES = cmdline.c
+endif
+
+###########
+# fprintf #
+###########
+
+if WITH_PRINTF
+if WITH_FILE
+TESTS += fprintf
+fprintf_LDADD = $(top_builddir)/libkernaux.la
+fprintf_SOURCES = fprintf.c
+endif
+endif
+
+##############
+# fprintf_va #
+##############
+
+if WITH_PRINTF
+if WITH_FILE
+TESTS += fprintf_va
+fprintf_va_LDADD = $(top_builddir)/libkernaux.la
+fprintf_va_SOURCES = fprintf_va.c
+endif
+endif
+
+########
+# ntoa #
+########
+
+if WITH_NTOA
+TESTS += ntoa
+ntoa_LDADD = $(top_builddir)/libkernaux.la
+ntoa_SOURCES = ntoa.c
+endif
+
+################
+# panic_guards #
+################
+
+TESTS += panic_guards
+panic_guards_LDADD = $(top_builddir)/libkernaux.la
+panic_guards_SOURCES = panic_guards.c
+
+################
+# panic_simple #
+################
+
+TESTS += panic_simple
+panic_simple_LDADD = $(top_builddir)/libkernaux.la
+panic_simple_SOURCES = panic_simple.c
+
+#######
+# pfa #
+#######
+
+if WITH_PFA
+TESTS += pfa
+pfa_LDADD = $(top_builddir)/libkernaux.la
+pfa_SOURCES = pfa.c
+endif
+
+##############
+# printf_fmt #
+##############
+
+if WITH_PRINTF_FMT
+TESTS += printf_fmt
+printf_fmt_LDADD = $(top_builddir)/libkernaux.la
+printf_fmt_SOURCES = printf_fmt.c
+endif
+
+############
+# snprintf #
+############
+
+if WITH_PRINTF
+TESTS += snprintf
+snprintf_LDADD = $(top_builddir)/libkernaux.la
+snprintf_SOURCES = snprintf.c
+endif
+
+###############
+# snprintf_va #
+###############
+
+if WITH_PRINTF
+TESTS += snprintf_va
+snprintf_va_LDADD = $(top_builddir)/libkernaux.la
+snprintf_va_SOURCES = snprintf_va.c
+endif
+
+###############
+# units_human #
+###############
+
+if WITH_UNITS
+TESTS += units_human
+units_human_LDADD = $(top_builddir)/libkernaux.la
+units_human_SOURCES = units_human.c
+endif
diff --git a/examples/arch-riscv64-min/Makefile b/examples/arch-riscv64-min/Makefile
index 9381a74b..ac2b6844 100644
--- a/examples/arch-riscv64-min/Makefile
+++ b/examples/arch-riscv64-min/Makefile
@@ -34,9 +34,7 @@ $(KERNEL): $(LINKERSCR) $(OBJS) build-libkernaux.a
 	$(CC) -T $(LINKERSCR) -o $@ $(OBJS) -nostdlib -lkernaux -lgcc -Wl,-L$(LIBKERNAUX_DEST)/lib
 
 build-libkernaux.a:
-	cd $(LIBKERNAUX_BUILD) && ./config
-	cd $(LIBKERNAUX_BUILD) && make libkernaux.a
-	cd $(LIBKERNAUX_BUILD) && make install-data install-exec
+	cd $(LIBKERNAUX_BUILD) && ./config && make install
 
 %.c.o: %.c
 	$(CC) -c $< -o $@ $(CFLAGS)
diff --git a/examples/bootloader-multiboot2-grub/Makefile b/examples/bootloader-multiboot2-grub/Makefile
index cf8bf34f..0059f72b 100644
--- a/examples/bootloader-multiboot2-grub/Makefile
+++ b/examples/bootloader-multiboot2-grub/Makefile
@@ -53,9 +53,7 @@ $(KERNEL): $(LINKERSCR) build-libkernaux.a $(OBJS)
 	$(GRUB_FILE) --is-x86-multiboot2 $@
 
 build-libkernaux.a:
-	cd $(LIBKERNAUX_BUILD) && ./config
-	cd $(LIBKERNAUX_BUILD) && make libkernaux.a
-	cd $(LIBKERNAUX_BUILD) && make install-data install-exec
+	cd $(LIBKERNAUX_BUILD) && ./config && make install
 
 %.c.o: %.c
 	$(CC) -c $< -o $@ $(CFLAGS)
diff --git a/examples/bootloader-multiboot2-limine/Makefile b/examples/bootloader-multiboot2-limine/Makefile
index 6240c9ce..a488e548 100644
--- a/examples/bootloader-multiboot2-limine/Makefile
+++ b/examples/bootloader-multiboot2-limine/Makefile
@@ -78,9 +78,7 @@ $(FULL_LIMINE_SYS):
 	cp -f $(LIMINE_SYS) $(FULL_LIMINE_SYS)
 
 build-libkernaux.a:
-	cd $(LIBKERNAUX_BUILD) && ./config
-	cd $(LIBKERNAUX_BUILD) && make libkernaux.a
-	cd $(LIBKERNAUX_BUILD) && make install-data install-exec
+	cd $(LIBKERNAUX_BUILD) && ./config && make install
 
 %.c.o: %.c
 	$(CC) -c $< -o $@ $(CFLAGS)
diff --git a/examples/bootloader-stivale2-limine/Makefile b/examples/bootloader-stivale2-limine/Makefile
index 11e4d7dd..11570203 100644
--- a/examples/bootloader-stivale2-limine/Makefile
+++ b/examples/bootloader-stivale2-limine/Makefile
@@ -82,9 +82,7 @@ $(FULL_LIMINE_SYS):
 	cp -f $(LIMINE_SYS) $(FULL_LIMINE_SYS)
 
 build-libkernaux.a:
-	cd $(LIBKERNAUX_BUILD) && ./config
-	cd $(LIBKERNAUX_BUILD) && make libkernaux.a
-	cd $(LIBKERNAUX_BUILD) && make install-data install-exec
+	cd $(LIBKERNAUX_BUILD) && ./config && make install
 
 %.c.o: %.c
 	$(CC) -c $< -o $@ $(CFLAGS)
diff --git a/libc/.gitignore b/libc/.gitignore
new file mode 100644
index 00000000..bda046fb
--- /dev/null
+++ b/libc/.gitignore
@@ -0,0 +1,4 @@
+/Makefile
+/Makefile.in
+/include/Makefile
+/include/Makefile.in
diff --git a/libc/Makefile.am b/libc/Makefile.am
new file mode 100644
index 00000000..21ae55a9
--- /dev/null
+++ b/libc/Makefile.am
@@ -0,0 +1,14 @@
+include $(top_srcdir)/shared.am
+
+SUBDIRS = include
+
+if ENABLE_SPLIT_LIBC
+lib_LTLIBRARIES = libc.la
+else
+EXTRA_LTLIBRARIES = libc.la
+endif
+
+libc_la_SOURCES = \
+	src/ctype.c \
+	src/stdlib.c \
+	src/string.c
diff --git a/libc/include/Makefile.am b/libc/include/Makefile.am
index cbba1577..16e77698 100644
--- a/libc/include/Makefile.am
+++ b/libc/include/Makefile.am
@@ -1,6 +1,4 @@
-if WITH_LIBC
 nobase_include_HEADERS = \
 	ctype.h \
 	stdlib.h \
 	string.h
-endif
diff --git a/libm/.gitignore b/libm/.gitignore
new file mode 100644
index 00000000..bda046fb
--- /dev/null
+++ b/libm/.gitignore
@@ -0,0 +1,4 @@
+/Makefile
+/Makefile.in
+/include/Makefile
+/include/Makefile.in
diff --git a/libm/Makefile.am b/libm/Makefile.am
new file mode 100644
index 00000000..7b44930a
--- /dev/null
+++ b/libm/Makefile.am
@@ -0,0 +1,11 @@
+include $(top_srcdir)/shared.am
+
+SUBDIRS = include
+
+if ENABLE_SPLIT_LIBM
+lib_LTLIBRARIES = libm.la
+else
+EXTRA_LTLIBRARIES = libm.la
+endif
+
+libm_la_SOURCES = src/main.c
diff --git a/libm/include/Makefile.am b/libm/include/Makefile.am
new file mode 100644
index 00000000..b6c12b44
--- /dev/null
+++ b/libm/include/Makefile.am
@@ -0,0 +1 @@
+nobase_include_HEADERS = math.h
diff --git a/libm/include/math.h b/libm/include/math.h
new file mode 100644
index 00000000..17130191
--- /dev/null
+++ b/libm/include/math.h
@@ -0,0 +1,12 @@
+#ifndef _MATH_H
+#define _MATH_H 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/libm/src/main.c b/libm/src/main.c
new file mode 100644
index 00000000..55073487
--- /dev/null
+++ b/libm/src/main.c
@@ -0,0 +1,8 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <math.h>
+
+__attribute__((unused))
+static const int foobar = 0;
diff --git a/m4/.keep b/m4/.keep
new file mode 100644
index 00000000..e69de29b
diff --git a/shared.am b/shared.am
new file mode 100644
index 00000000..bf730741
--- /dev/null
+++ b/shared.am
@@ -0,0 +1,33 @@
+# vim: set syntax=automake:
+
+AM_CFLAGS = \
+	-std=c99 \
+	-pedantic \
+	-Wall \
+	-Wextra \
+	-I$(top_builddir)/include \
+	-I$(top_srcdir)/include \
+	-D_POSIX_C_SOURCE=200809L
+
+if WITH_LIBC
+AM_CFLAGS += \
+	-I$(top_builddir)/libc/include \
+	-I$(top_srcdir)/libc/include
+endif
+
+if WITH_LIBM
+AM_CFLAGS += \
+	-I$(top_builddir)/libm/include \
+	-I$(top_srcdir)/libm/include
+endif
+
+if ENABLE_WERROR
+AM_CFLAGS += -Werror
+endif
+
+# TODO: DRY (configure.ac)
+if ENABLE_FREESTANDING
+AM_CFLAGS += -nostdlib -ffreestanding -fno-pic -fno-stack-protector
+else
+AM_CFLAGS += -fpic
+endif
diff --git a/tests/.gitignore b/tests/.gitignore
new file mode 100644
index 00000000..b336cc7c
--- /dev/null
+++ b/tests/.gitignore
@@ -0,0 +1,2 @@
+/Makefile
+/Makefile.in
diff --git a/tests/Makefile.am b/tests/Makefile.am
new file mode 100644
index 00000000..98768ed2
--- /dev/null
+++ b/tests/Makefile.am
@@ -0,0 +1,265 @@
+include $(top_srcdir)/shared.am
+
+CLEANFILES =
+TESTS =
+noinst_PROGRAMS = $(TESTS)
+
+############################
+# multiboot2_header_print1 #
+############################
+
+if WITH_MULTIBOOT2
+noinst_PROGRAMS += multiboot2_header_print1
+multiboot2_header_print1_LDADD = $(top_builddir)/libkernaux.la
+multiboot2_header_print1_SOURCES = \
+	multiboot2_header_print1.c \
+	multiboot2_header_example1.h
+endif
+
+############################
+# multiboot2_header_print2 #
+############################
+
+if WITH_MULTIBOOT2
+noinst_PROGRAMS += multiboot2_header_print2
+multiboot2_header_print2_LDADD = $(top_builddir)/libkernaux.la
+multiboot2_header_print2_SOURCES = \
+	multiboot2_header_print2.c \
+	multiboot2_header_example2.h
+endif
+
+##########################
+# multiboot2_info_print1 #
+##########################
+
+if WITH_MULTIBOOT2
+noinst_PROGRAMS += multiboot2_info_print1
+multiboot2_info_print1_LDADD = $(top_builddir)/libkernaux.la
+multiboot2_info_print1_SOURCES = \
+	multiboot2_info_print1.c \
+	multiboot2_info_example1.h
+endif
+
+##########################
+# multiboot2_info_print2 #
+##########################
+
+if WITH_MULTIBOOT2
+noinst_PROGRAMS += multiboot2_info_print2
+multiboot2_info_print2_LDADD = $(top_builddir)/libkernaux.la
+multiboot2_info_print2_SOURCES = \
+	multiboot2_info_print2.c \
+	multiboot2_info_example2.h
+endif
+
+################
+# test_cmdline #
+################
+
+if WITH_CMDLINE
+TESTS += test_cmdline
+test_cmdline_LDADD = $(top_builddir)/libkernaux.la
+test_cmdline_SOURCES = test_cmdline.c
+endif
+
+####################
+# test_cmdline_gen #
+####################
+
+if ENABLE_TESTS_PYTHON
+if WITH_CMDLINE
+TESTS += test_cmdline_gen
+test_cmdline_gen_LDADD = $(top_builddir)/libkernaux.la
+test_cmdline_gen_SOURCES = \
+	test_cmdline_gen.c \
+	cmdline_gen.py \
+	cmdline_gen.jinja \
+	$(top_srcdir)/common/cmdline.yml
+endif
+endif
+
+CLEANFILES += test_cmdline_gen.c
+
+test_cmdline_gen.c: cmdline_gen.py cmdline_gen.jinja $(top_srcdir)/common/cmdline.yml
+	python3 cmdline_gen.py
+
+############
+# test_elf #
+############
+
+if WITH_ELF
+TESTS += test_elf
+test_elf_LDADD = $(top_builddir)/libkernaux.la
+test_elf_SOURCES = test_elf.c
+endif
+
+############
+# test_mbr #
+############
+
+if WITH_MBR
+TESTS += test_mbr
+test_mbr_LDADD = $(top_builddir)/libkernaux.la
+test_mbr_SOURCES = test_mbr.c
+endif
+
+##################################
+# test_multiboot2_header_helpers #
+##################################
+
+if WITH_MULTIBOOT2
+TESTS += test_multiboot2_header_helpers
+test_multiboot2_header_helpers_LDADD = $(top_builddir)/libkernaux.la
+test_multiboot2_header_helpers_SOURCES = \
+	test_multiboot2_header_helpers.c \
+	multiboot2_header_example1.h \
+	multiboot2_header_example2.h
+endif
+
+################################
+# test_multiboot2_header_print #
+################################
+
+if WITH_MULTIBOOT2
+TESTS += test_multiboot2_header_print
+test_multiboot2_header_print_DEPENDENCIES = \
+	multiboot2_header_print1 \
+	multiboot2_header_print2
+test_multiboot2_header_print_LDADD = $(top_builddir)/libkernaux.la
+test_multiboot2_header_print_SOURCES = test_multiboot2_header_print.c
+endif
+
+#####################################
+# test_multiboot2_header_validation #
+#####################################
+
+if WITH_MULTIBOOT2
+TESTS += test_multiboot2_header_validation
+test_multiboot2_header_validation_LDADD = $(top_builddir)/libkernaux.la
+test_multiboot2_header_validation_SOURCES = \
+	test_multiboot2_header_validation.c \
+	multiboot2_header_example1.h \
+	multiboot2_header_example2.h
+endif
+
+################################
+# test_multiboot2_info_helpers #
+################################
+
+if WITH_MULTIBOOT2
+TESTS += test_multiboot2_info_helpers
+test_multiboot2_info_helpers_LDADD = $(top_builddir)/libkernaux.la
+test_multiboot2_info_helpers_SOURCES = \
+	test_multiboot2_info_helpers.c \
+	multiboot2_info_example1.h \
+	multiboot2_info_example2.h
+endif
+
+##############################
+# test_multiboot2_info_print #
+##############################
+
+if WITH_MULTIBOOT2
+TESTS += test_multiboot2_info_print
+test_multiboot2_info_print_DEPENDENCIES = \
+	multiboot2_info_print1 \
+	multiboot2_info_print2
+test_multiboot2_info_print_LDADD = $(top_builddir)/libkernaux.la
+test_multiboot2_info_print_SOURCES = test_multiboot2_info_print.c
+endif
+
+###################################
+# test_multiboot2_info_validation #
+###################################
+
+if WITH_MULTIBOOT2
+TESTS += test_multiboot2_info_validation
+test_multiboot2_info_validation_LDADD = $(top_builddir)/libkernaux.la
+test_multiboot2_info_validation_SOURCES = \
+	test_multiboot2_info_validation.c \
+	multiboot2_info_example1.h \
+	multiboot2_info_example2.h
+endif
+
+#############
+# test_ntoa #
+#############
+
+if WITH_NTOA
+TESTS += test_ntoa
+test_ntoa_LDADD = $(top_builddir)/libkernaux.la
+test_ntoa_SOURCES = test_ntoa.c
+endif
+
+############
+# test_pfa #
+############
+
+if WITH_PFA
+TESTS += test_pfa
+test_pfa_LDADD = $(top_builddir)/libkernaux.la
+test_pfa_SOURCES = test_pfa.c
+endif
+
+###################
+# test_pfa_assert #
+###################
+
+if WITH_PFA
+TESTS += test_pfa_assert
+test_pfa_assert_LDADD = $(top_builddir)/libkernaux.la
+test_pfa_assert_SOURCES = test_pfa_assert.c
+endif
+
+#######################
+# test_printf_fmt_gen #
+#######################
+
+if ENABLE_TESTS_PYTHON
+if WITH_PRINTF_FMT
+TESTS += test_printf_fmt_gen
+test_printf_fmt_gen_LDADD = $(top_builddir)/libkernaux.la
+test_printf_fmt_gen_SOURCES = \
+	test_printf_fmt_gen.c \
+	printf_fmt_gen.py \
+	printf_fmt_gen.jinja \
+	$(top_srcdir)/common/printf_fmt.yml
+endif
+endif
+
+CLEANFILES += test_printf_fmt_gen.c
+
+test_printf_fmt_gen.c: printf_fmt_gen.py printf_fmt_gen.jinja $(top_srcdir)/common/printf_fmt.yml
+	python3 printf_fmt_gen.py
+
+###################
+# test_printf_gen #
+###################
+
+if ENABLE_TESTS_PYTHON
+if WITH_PRINTF
+TESTS += test_printf_gen
+test_printf_gen_LDADD = $(top_builddir)/libkernaux.la
+test_printf_gen_SOURCES = \
+	test_printf_gen.c \
+	printf_gen.py \
+	printf_gen.jinja \
+	$(top_srcdir)/common/printf.yml \
+	$(top_srcdir)/common/printf_orig.yml
+endif
+endif
+
+CLEANFILES += test_printf_gen.c
+
+test_printf_gen.c: printf_gen.py printf_gen.jinja $(top_srcdir)/common/printf.yml $(top_srcdir)/common/printf_orig.yml
+	python3 printf_gen.py
+
+####################
+# test_units_human #
+####################
+
+if WITH_UNITS
+TESTS += test_units_human
+test_units_human_LDADD = $(top_builddir)/libkernaux.la
+test_units_human_SOURCES = test_units_human.c
+endif
diff --git a/tests/test_multiboot2_header_print.c b/tests/test_multiboot2_header_print.c
index ccf9ed64..97c8bdce 100644
--- a/tests/test_multiboot2_header_print.c
+++ b/tests/test_multiboot2_header_print.c
@@ -74,7 +74,7 @@ static const char output2[] =
 int main()
 {
     {
-        FILE *const fd = popen("tests/multiboot2_header_print1", "r");
+        FILE *const fd = popen("./multiboot2_header_print1", "r");
         assert(fd != NULL);
 
         for (const char *ch = output1; *ch; ++ch) {
@@ -86,7 +86,7 @@ int main()
     }
 
     {
-        FILE *const fd = popen("tests/multiboot2_header_print2", "r");
+        FILE *const fd = popen("./multiboot2_header_print2", "r");
         assert(fd != NULL);
 
         for (const char *ch = output2; *ch; ++ch) {
diff --git a/tests/test_multiboot2_info_print.c b/tests/test_multiboot2_info_print.c
index c86fe315..8692cf81 100644
--- a/tests/test_multiboot2_info_print.c
+++ b/tests/test_multiboot2_info_print.c
@@ -271,7 +271,7 @@ static const char output2[] =
 int main()
 {
     {
-        FILE *const fd = popen("tests/multiboot2_info_print1", "r");
+        FILE *const fd = popen("./multiboot2_info_print1", "r");
         assert(fd != NULL);
 
         for (const char *ch = output1; *ch; ++ch) {
@@ -283,7 +283,7 @@ int main()
     }
 
     {
-        FILE *const fd = popen("tests/multiboot2_info_print2", "r");
+        FILE *const fd = popen("./multiboot2_info_print2", "r");
         assert(fd != NULL);
 
         for (const char *ch = output2; *ch; ++ch) {