diff --git a/README.md b/README.md
index 6a95159..0bd738f 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ Packages
 
 | Debian                   | Gentoo                        |
 |--------------------------|-------------------------------|
+|                          | `dev-util/ccache`             |
 | `bash-completion`        |                               |
 | `build-essential`        |                               |
 | `cmake`                  | `dev-util/cmake`              |
diff --git a/files.sh b/files.sh
index 6a15bb0..b3ad1a0 100644
--- a/files.sh
+++ b/files.sh
@@ -14,16 +14,21 @@ install_file root root    644 '/etc/fish/functions/rvm.fish'              common
 
 if [ "$PREFIX" = 'gentoo' ]; then
 echo
+install_file root root    644 '/etc/ccache.conf'                          gentoo
 install_file root root    644 '/etc/conf.d/display-manager'               gentoo
 install_file root root    644 '/etc/env.d/90xsession'                     gentoo
 install_file root portage 644 '/var/lib/portage/world'                    gentoo
 echo
+install_dir  root root    755 '/etc/portage/env'
 install_dir  root root    755 '/etc/portage/package.accept_keywords'
+install_dir  root root    755 '/etc/portage/package.env'
 install_dir  root root    755 '/etc/portage/package.mask'
 install_dir  root root    755 '/etc/portage/package.use'
+install_file root root    644 '/etc/portage/env/ccache.conf'              gentoo
 install_file root root    644 '/etc/portage/make.conf'                    gentoo
 install_file root root    644 '/etc/portage/package.license'              gentoo
 install_file root root    644 '/etc/portage/package.accept_keywords/package.accept_keywords' gentoo
+install_file root root    644 '/etc/portage/package.env/ccache'           gentoo
 install_file root root    644 '/etc/portage/package.mask/toolchains'      gentoo
 install_file root root    644 '/etc/portage/package.use/toolchains'       gentoo
 install_file root root    644 '/etc/portage/package.use/zz-autounmask'    gentoo
diff --git a/gentoo/etc/ccache.conf b/gentoo/etc/ccache.conf
new file mode 100644
index 0000000..7b85524
--- /dev/null
+++ b/gentoo/etc/ccache.conf
@@ -0,0 +1,4 @@
+# Also edit /etc/portage/env/ccache.conf
+cache_dir = /var/cache/ccache
+compiler_check = %compiler% -dumpmachine; %compiler% -dumpversion
+max_size = 5G
diff --git a/gentoo/etc/portage/env/ccache.conf b/gentoo/etc/portage/env/ccache.conf
new file mode 100644
index 0000000..b883228
--- /dev/null
+++ b/gentoo/etc/portage/env/ccache.conf
@@ -0,0 +1,5 @@
+# Also edit /etc/ccache.conf
+FEATURES='ccache'
+CCACHE_DIR='/var/cache/ccache'
+CCACHE_COMPILERCHECK='%compiler% -dumpmachine; %compiler% -dumpversion'
+CCACHE_MAXSIZE='5G'
diff --git a/gentoo/etc/portage/package.env/ccache b/gentoo/etc/portage/package.env/ccache
new file mode 100644
index 0000000..6b10e69
--- /dev/null
+++ b/gentoo/etc/portage/package.env/ccache
@@ -0,0 +1,13 @@
+dev-lang/spidermonkey   ccache.conf
+dev-util/cmake          ccache.conf
+mail-client/thunderbird ccache.conf
+media-libs/mesa         ccache.conf
+media-video/ffmpeg      ccache.conf
+#net-im/telegram-desktop ccache.conf # does not work
+net-libs/nodejs         ccache.conf
+sys-devel/clang         ccache.conf
+sys-devel/llvm          ccache.conf
+sys-libs/glibc          ccache.conf
+www-client/chromium     ccache.conf
+www-client/firefox      ccache.conf
+x11-libs/gtk+           ccache.conf