* Make perl a dependency of Nix.

corepkgs/buildenv/Makefile.am

@@ -1,3 +1,5 @@
+all-local: builder.pl
+
 install-exec-local:
 	$(INSTALL) -d $(DESTDIR)$(datadir)/nix/corepkgs
 	$(INSTALL) -d $(DESTDIR)$(datadir)/nix/corepkgs/buildenv
@@ -6,4 +8,4 @@ install-exec-local:
 
 include ../../substitute.mk
 
-EXTRA_DIST = default.nix builder.pl
+EXTRA_DIST = default.nix builder.pl.in

corepkgs/buildenv/builder.pl.in

@@ -1,4 +1,4 @@
-#! /usr/bin/perl -w
+#! @perl@ -w
 
 use strict;
 use Cwd;