--- Makefile.am.orig	2016-07-21 12:25:09 UTC
+++ Makefile.am
@@ -512,7 +512,7 @@ install-plugins install-plugin uninstall
 apidoc:
 	$(MAKE) -C doc $@
 
-pkgconfigdir = $(libdir)/pkgconfig
+pkgconfigdir = $(exec_prefix)/libdata/pkgconfig
 pkgconfig_DATA = \
 	gnash.pc \
 	$(NULL)