--- onig-config.in
+++ onig-config.in
@@ -30,6 +30,8 @@
 prefix=@prefix@
 exec_prefix=@exec_prefix@
 is_set_exec_prefix=no
+includedir=@includedir@
+libdir=@libdir@

 while test $# -gt 0; do
   case "$1" in
@@ -57,13 +59,13 @@
       echo $exec_prefix
       ;;
     --cflags)
-      if test @includedir@ != /usr/include ; then
-        show_includedir=-I@includedir@
+      if test ${includedir} != /usr/include ; then
+        show_includedir=-I${includedir}
       fi
       echo $show_includedir
       ;;
     --libs)
-      echo -L@libdir@ -lonig
+      echo -L${libdir} -lonig
       ;;
     --version)
       echo $ONIG_VERSION