--- mercury-extras-0.13.1.orig/posix/Mmakefile	2004-02-11 17:35:14.000000000 +1300
+++ mercury-extras-0.13.1/posix/Mmakefile	2006-12-04 22:06:43.000000000 +1300
@@ -34,7 +34,7 @@
 
 .PHONY: install
 install: libposix.install
-	cp $(ADDITIONAL_HDRS) $(INSTALL_PREFIX)/lib/mercury/inc
+	cp $(ADDITIONAL_HDRS) $(INSTALL_LIBDIR)/inc
 
 .PHONY: clean
 clean: