diff -up pl-5.7.11/src/pl.pc.in.pc pl-5.7.11/src/pl.pc.in
--- pl-5.7.11/src/pl.pc.in.pc 2009-08-14 18:00:33.000000000 +0200
+++ pl-5.7.11/src/pl.pc.in 2009-08-14 18:01:03.000000000 +0200
@@ -1,7 +1,7 @@
prefix=@prefix@
exec_prefix=@exec_prefix@
libdir=@libdir@
-includedir=@includedir@
+includedir=${libdir}/@PL@-@PLVERSION@/include
PLBASE=${libdir}/@PL@-@PLVERSION@
PLARCH=@ARCH@