diff --git a/INSTALL.md b/INSTALL.md
index 903374e..8b3949c 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -32,11 +32,11 @@ Build and Install
   ARIF can be built and installed from source using the GNU build system.
 
   Notable build options:
-  - `--with-readline[=PREFIX]` (default), `--without-readline`
+  - `--with-readline[=PKGCONFIGDIR]` (default), `--without-readline`
     * Whether to build the ARIF library with GNU Readline features.
   - `--enable-arify` (default), `--disable-arify`
     * Whether to build the `arify` command-line tool.
-  - `--with-rime[=PREFIX]`, `--without-rime` (default)
+  - `--with-rime[=PKGCONFIGDIR]`, `--without-rime` (default)
     * Whether to build the example Rime IME integration.
 
   Example shell script:
diff --git a/Makefile.am b/Makefile.am
index 289a427..1fa8f3c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -11,5 +11,4 @@ ACLOCAL_AMFLAGS = -I m4
 SUBDIRS = doc examples include src tests
 
 
-pkgconfigdir   = $(libdir)/pkgconfig
 pkgconfig_DATA = arif.pc
diff --git a/configure.ac b/configure.ac
index f180ad2..4b7e9a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -91,6 +91,7 @@ AC_CHECK_FUNCS([atexit memchr strcasecmp])
 
 # -- Output --
 
+PKG_INSTALLDIR()
 AC_CONFIG_FILES([
     Makefile
     doc/Makefile
diff --git a/m4/arif_ac.m4 b/m4/arif_ac.m4
index 1dd83f3..dd5c18c 100644
--- a/m4/arif_ac.m4
+++ b/m4/arif_ac.m4
@@ -43,13 +43,13 @@ dnl
 AC_DEFUN([ARIF_CHECK_PKG], [
     m4_pushdef([with_var_], [with_]m4_translit([$1], [-+.], [___]))
     AC_ARG_WITH([$1], m4_normalize([
-        AS_HELP_STRING([--with-$1[[=PREFIX]]], [installation path of $3])
+        AS_HELP_STRING(
+		[--with-$1[[=PKGCONFIGDIR]]], [pkg-config search path for $3])
     ]), [], [$4])
     AS_VAR_IF(with_var_, [no], [$6], [
         AS_VAR_SET([SAVED_PKG_CONFIG_PATH_], ["${PKG_CONFIG_PATH}"])
         AS_VAR_IF(with_var_, [yes], [], [
-            AS_VAR_SET([PKG_CONFIG_PATH],
-                    ["${with_$1}/lib/pkgconfig:${PKG_CONFIG_PATH}"])
+            AS_VAR_SET([PKG_CONFIG_PATH], ["${with_$1}:${PKG_CONFIG_PATH}"])
         ])
         export PKG_CONFIG_PATH
         PKG_CHECK_MODULES(m4_toupper([$1]), [$1 $2], [$5])