Substitute in the path to localbase in the runtime package file,
so it can find libgmp.

--- mk/package.mk.orig	Wed Aug  6 13:40:45 2003
+++ mk/package.mk	Wed Aug  6 13:41:06 2003
@@ -9,10 +9,12 @@
 ifeq "$(way)" ""
 
 package.conf.inplace   : package.conf.in
+	perl -pi.bak -e 's,LOCALBASE,'$(LOCALBASE)',' $<
 	$(CPP) $(RAWCPP_FLAGS) -I$(GHC_INCLUDE_DIR) -x c $(PACKAGE_CPP_OPTS) $< \
 		| sed 's/^#.*$$//g' >$@
 
 package.conf.installed : package.conf.in
+	perl -pi.bak -e 's,LOCALBASE,'$(LOCALBASE)',' $<
 	$(CPP) $(RAWCPP_FLAGS) -I$(GHC_INCLUDE_DIR) -DINSTALLING -x c $(PACKAGE_CPP_OPTS) $< \
 		| sed 's/^#.*$$//g' >$@
 
