diff --git a/libcaca.spec b/libcaca.spec
index 57f5a63..9d7d5b8 100644
--- a/libcaca.spec
+++ b/libcaca.spec
@@ -58,6 +58,8 @@ sprite blitting.
 
 %build
 %configure \
+    --x-includes=%{_includedir} \
+    --x-libraries=%{_libdir} \
     --enable-slang \
     --enable-ncurses \
     --enable-x11 \
@@ -104,6 +106,7 @@ sprite blitting.
 %changelog
 * Thu Nov 17 2005 Matthias Saou <http://freshrpms.net/> 0.9-7
 - Change XFree86-devel requirements to libX11-devel.
+- Force --x-includes= and --x-libraries=, otherwise -L gets passed empty.
 
 * Fri Apr  1 2005 Michael Schwendt <mschwendt[AT]users.sf.net> 0.9-6
 - Include libcaca datadir.