https://bugs.gentoo.org/show_bug.cgi?id=380741
--- makefile.in.orig	2012-09-21 21:18:13.373938147 +0000
+++ makefile.in	2012-09-21 21:17:56.294552425 +0000
@@ -825,9 +825,12 @@
 	test -f $$file || co $$file ;\
 	done
 
+XSUBPP = `$(PERL) -MModule::Build -e'print Module::Build::ModuleInfo->find_module_by_name("ExtUtils::xsubpp")'`
+TYPEMAP = `$(PERL) -MModule::Build -e'print Module::Build::ModuleInfo->find_module_by_name("ExtUtils::typemap")'`
+
 perl.c: $(srcdir)/perl.xs $(srcdir)/ptypemap
-	$(PERL) $(PERLLIB)/ExtUtils/xsubpp \
-		-typemap $(PERLLIB)/ExtUtils/typemap \
+	$(PERL) $(XSUBPP) \
+		-typemap $(TYPEMAP) \
 		-typemap ptypemap \
 		$(srcdir)/perl.xs > $@