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