diff --git a/Makefile.am b/Makefile.am
index 13dfc63..5c5603a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -311,6 +311,9 @@ libtool: $(ltmain_sh) $(config_status) $(dotversion)
 
 include libltdl/ltdl.mk
 
+libltdl_libltdl_la_CPPFLAGS += $(CUSTOM_LTDL_CFLAGS)
+libltdl_libltdl_la_LDFLAGS  += $(CUSTOM_LTDL_LDFLAGS)
+
 lt_aclocal_m4	= $(srcdir)/$(ltdl_dir)/aclocal.m4
 lt_config_h_in	= $(srcdir)/$(ltdl_dir)/config-h.in
 lt_configure	= $(srcdir)/$(ltdl_dir)/configure