--- sigscheme/libgcroots/Makefile.in.orig	2007-09-25 01:58:25.000000000 +0900
+++ sigscheme/libgcroots/Makefile.in	2007-09-25 01:59:00.000000000 +0900
@@ -345,7 +345,7 @@
 	include/gc_config_macros.h include/private/gc_hdrs.h \
 	include/private/gc_locks.h include/private/gc_priv.h \
 	include/private/gcconfig.h
-pkgconfigdir = $(libdir)/pkgconfig
+pkgconfigdir = $(prefix)/libdata/pkgconfig
 pkgconfig_DATA = gcroots.pc
 libgcroots_la_SOURCES = mark.c gcroots.c