diff -Naur libdvdnav.orig/m4/Makefile.am libdvdnav/m4/Makefile.am
--- libdvdnav.orig/m4/Makefile.am	2008-10-03 21:11:42.000000000 +0100
+++ libdvdnav/m4/Makefile.am	2009-07-12 11:30:14.035237517 +0100
@@ -2,10 +2,6 @@
 
 EXTRA_DIST = dvdnav.m4
 
-if INSTALL_M4
-m4datadir = @ACLOCAL_DIR@
-else
 m4datadir = $(datadir)/aclocal
-endif
 
 m4data_DATA = dvdnav.m4