diff --git a/lablgl.spec b/lablgl.spec
index 0164a06..7613a3f 100644
--- a/lablgl.spec
+++ b/lablgl.spec
@@ -28,10 +28,10 @@ extension, or with open-source Mesa.
 cat > Makefile.config <<EOF
 CAMLC = ocamlc.opt
 CAMLOPT = ocamlopt.opt
-BINDIR = /usr/bin
-XINCLUDES = -I/usr/X11R6/include
-XLIBS = -L/usr/X11R6/lib -lXext -lXmu -lX11
-TKINCLUDES = -I/usr/include
+BINDIR = %{_bindir}
+XINCLUDES = -I%{_prefix}/X11R6/include
+XLIBS = -L%{_prefix}/X11R6/%{_lib} -lXext -lXmu -lX11
+TKINCLUDES = -I%{_includedir}
 GLINCLUDES =
 GLLIBS = -lGL -lGLU
 GLUTLIBS = -lglut -lXxf86vm