diff --git a/configure.in b/configure.in
index 2bf9c5692..910b18fe6 100644
--- a/configure.in
+++ b/configure.in
@@ -151,6 +151,7 @@ AC_ARG_WITH(camlibdir,
   camlibdir="$withval", camlibdir='${libdir}/gphoto2')
 AC_MSG_RESULT("$camlibdir")
 AC_SUBST(camlibdir)
+AC_DEFINE(CAMLIBDIR,"$camlibdir",[where to install camlibs])
 
 dnl ---------------------------------------------------------------------------
 dnl Camera drivers