http://bugs.gentoo.org/339298

--- lib/gvc/gvcext.h
+++ lib/gvc/gvcext.h
@@ -80,9 +80,11 @@
 #if defined(GVDLL)
 	__declspec(dllexport) lt_symlist_t lt_preloaded_symbols[];
 #else
+#if !defined(LTDL_H)
 	extern lt_symlist_t lt_preloaded_symbols[];
 #endif
 #endif
+#endif
 
 
 #ifdef __cplusplus
--- lib/gvc/Makefile.am
+++ lib/gvc/Makefile.am
@@ -18,7 +18,7 @@
 	-I$(top_srcdir)/lib/pathplan \
 	-I$(top_srcdir)/lib/$(GRAPH) \
 	-I$(top_srcdir)/lib/cdt \
-	$(INCLTDL) -I$(top_srcdir)/libltdl \
+	$(INCLTDL) \
 	-DGVLIBDIR=\"$(pkglibdir)\"
 
 if WITH_WIN32