--- Makefile.am
+++ Makefile.am
@@ -21,7 +21,7 @@
 
 AM_CPPFLAGS = -I$(top_builddir) -I$(top_srcdir)
 
-ACLOCAL_AMFLAGS = -Iltdl/m4 -I m4
+ACLOCAL_AMFLAGS = -I m4
 
 MODULECOMMONFLAGS = -no-undefined -module -avoid-version