diff --git a/ChangeLog b/ChangeLog
index 86221a16ea..4da5c90afb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,6 @@
-Wed Feb  6 17:32:36 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Wed Feb  6 17:32:41 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in, version.c: parametric architecture name for paths.
 
 	* configure.in (shvar_to_cpp): convert sh variable references
 	  by replacing with string literal forms in cpp.
diff --git a/configure.in b/configure.in
index 0b369bea04..cff998d53d 100644
--- a/configure.in
+++ b/configure.in
@@ -3143,8 +3143,8 @@ shvar_to_cpp() {
 	    -e 's/\${\([[A-Z][A-Z_]]*\)}/"\1"/g' \
 	    -e 's|\${libdir}|'"${libdir}|g" \
 	    -e 's/\${ruby_version}/"RUBY_LIB_VERSION"/g' \
-	    -e 's/\${arch}/"RUBY_ARCH"/g' \
-	    -e 's/\${sitearch}/"RUBY_SITEARCH"/g' \
+	    -e 's/\${arch}/"arch"/g' \
+	    -e 's/\${sitearch}/"arch"/g' \
 	    -e 's/\${vendorarchdir}/"RUBY_VENDOR_ARCH_LIB"/g' \
 	    -e 's/\${sitearchdir}/"RUBY_SITE_ARCH_LIB"/g' \
 	    -e 's/\${vendorlibdir}/"RUBY_VENDOR_LIB2"/g' \
@@ -3240,17 +3240,23 @@ shvar_to_cpp RUBY_LIB "${rubylibdir}"
 if test "x${RUBY_LIB}" != 'xRUBY_LIB_PREFIX"/"RUBY_LIB_VERSION'; then
     AC_DEFINE_UNQUOTED(RUBY_LIB, ${RUBY_LIB} !<verconf>!)
 fi
+shvar_to_cpp RUBY_ARCH_LIB_FOR "${rubyarchdir}"
+AC_DEFINE_UNQUOTED(RUBY_ARCH_LIB_FOR(arch), ${RUBY_ARCH_LIB_FOR} !<verconf>!)
 if test "x$sitedir" = xno; then
     AC_DEFINE(NO_RUBY_SITE_LIB, [] !<verconf>!)
 else
     shvar_to_cpp RUBY_SITE_LIB "${sitedir}"
     AC_DEFINE_UNQUOTED(RUBY_SITE_LIB, ${RUBY_SITE_LIB} !<verconf>!)
+    shvar_to_cpp RUBY_SITE_ARCH_LIB_FOR "${sitearchdir}"
+    AC_DEFINE_UNQUOTED(RUBY_SITE_ARCH_LIB_FOR(arch), ${RUBY_SITE_ARCH_LIB_FOR} !<verconf>!)
 fi
 if test "x$vendordir" = xno; then
     AC_DEFINE(NO_RUBY_VENDOR_LIB, [] !<verconf>!)
 else
     shvar_to_cpp RUBY_VENDOR_LIB "${vendordir}"
     AC_DEFINE_UNQUOTED(RUBY_VENDOR_LIB, ${RUBY_VENDOR_LIB} !<verconf>!)
+    shvar_to_cpp RUBY_VENDOR_ARCH_LIB_FOR "${vendorarchdir}"
+    AC_DEFINE_UNQUOTED(RUBY_VENDOR_ARCH_LIB_FOR(arch), ${RUBY_VENDOR_ARCH_LIB_FOR} !<verconf>!)
 fi
 
 AC_SUBST(arch)dnl
diff --git a/version.c b/version.c
index 26e275a2e4..282960d72f 100644
--- a/version.c
+++ b/version.c
@@ -42,13 +42,14 @@
 #define RUBY_LIB                    RUBY_LIB_PREFIX  "/"RUBY_LIB_VERSION
 #define RUBY_SITE_LIB2              RUBY_SITE_LIB    "/"RUBY_LIB_VERSION
 #define RUBY_VENDOR_LIB2            RUBY_VENDOR_LIB  "/"RUBY_LIB_VERSION
-#define RUBY_ARCHLIB                RUBY_LIB         "/"RUBY_ARCH
-#define RUBY_SITE_ARCHLIB           RUBY_SITE_LIB2   "/"RUBY_SITEARCH
-#define RUBY_VENDOR_ARCHLIB         RUBY_VENDOR_LIB2 "/"RUBY_SITEARCH
-#ifdef  RUBY_THINARCH
-#define RUBY_THIN_ARCHLIB           RUBY_LIB         "/"RUBY_THINARCH
-#define RUBY_SITE_THIN_ARCHLIB      RUBY_SITE_LIB2   "/"RUBY_THINARCH
-#define RUBY_VENDOR_THIN_ARCHLIB    RUBY_VENDOR_LIB2 "/"RUBY_THINARCH
+#ifndef RUBY_ARCH_LIB_FOR
+#define RUBY_ARCH_LIB_FOR(arch)        RUBY_LIB         "/"arch
+#endif
+#ifndef RUBY_SITE_ARCH_LIB_FOR
+#define RUBY_SITE_ARCH_LIB_FOR(arch)   RUBY_SITE_LIB2   "/"arch
+#endif
+#ifndef RUBY_VENDOR_ARCH_LIB_FOR
+#define RUBY_VENDOR_ARCH_LIB_FOR(arch) RUBY_VENDOR_LIB2 "/"arch
 #endif
 
 const int ruby_api_version[] = {
@@ -72,27 +73,27 @@ const char ruby_initial_load_paths[] =
 #endif
 #ifndef NO_RUBY_SITE_LIB
     RUBY_SITE_LIB2 "\0"
-#ifdef RUBY_SITE_THIN_ARCHLIB
-    RUBY_SITE_THIN_ARCHLIB "\0"
+#ifdef RUBY_THINARCH
+    RUBY_SITE_ARCH_LIB_FOR(RUBY_THINARCH) "\0"
 #endif
-    RUBY_SITE_ARCHLIB "\0"
+    RUBY_SITE_ARCH_LIB_FOR(RUBY_SITEARCH) "\0"
     RUBY_SITE_LIB "\0"
 #endif
 
 #ifndef NO_RUBY_VENDOR_LIB
     RUBY_VENDOR_LIB2 "\0"
-#ifdef RUBY_VENDOR_THIN_ARCHLIB
-    RUBY_VENDOR_THIN_ARCHLIB "\0"
+#ifdef RUBY_THINARCH
+    RUBY_VENDOR_ARCH_LIB_FOR(RUBY_THINARCH) "\0"
 #endif
-    RUBY_VENDOR_ARCHLIB "\0"
+    RUBY_VENDOR_ARCH_LIB_FOR(RUBY_SITEARCH) "\0"
     RUBY_VENDOR_LIB "\0"
 #endif
 
     RUBY_LIB "\0"
-#ifdef RUBY_THIN_ARCHLIB
-    RUBY_THIN_ARCHLIB "\0"
+#ifdef RUBY_THINARCH
+    RUBY_ARCH_LIB_FOR(RUBY_THINARCH) "\0"
 #endif
-    RUBY_ARCHLIB "\0"
+    RUBY_ARCH_LIB_FOR(RUBY_ARCH) "\0"
 #endif
     "";