* Make perl a dependency of Nix.

configure.ac

@@ -47,6 +47,11 @@ AC_PATH_PROG(xmllint, xmllint)
 AC_PATH_PROG(xsltproc, xsltproc)
 AC_PATH_PROG(flex, flex, false)
 AC_PATH_PROG(bison, bison, false)
+AC_PATH_PROG(perl, perl)
+if test -z "$perl"; then
+  echo "Perl is required for Nix."
+  exit 1
+fi
 
 AC_ARG_WITH(docbook-catalog, AC_HELP_STRING([--with-docbook-catalog=PATH],
   [path of the DocBook XML DTD]),

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;

scripts/nix-collect-garbage.in

@@ -1,4 +1,4 @@
-#! /usr/bin/perl -w
+#! @perl@ -w
 
 use strict;
 use IPC::Open2;

scripts/nix-install-package.in

@@ -1,4 +1,4 @@
-#! /usr/bin/perl -w
+#! @perl@ -w
 
 use strict;
 use POSIX qw(tmpnam);

scripts/nix-prefetch-url.in

@@ -1,4 +1,4 @@
-#! /usr/bin/perl -w
+#! @perl@ -w
 
 use strict;
 use IPC::Open2;

scripts/nix-pull.in

@@ -1,4 +1,4 @@
-#! /usr/bin/perl -w -I@libexecdir@/nix
+#! @perl@ -w -I@libexecdir@/nix
 
 use strict;
 use IPC::Open2;

scripts/nix-push.in

@@ -1,4 +1,4 @@
-#! /usr/bin/perl -w
+#! @perl@ -w
 
 use strict;
 use POSIX qw(tmpnam);

substitute.mk

@@ -9,6 +9,7 @@
 	 -e "s^@storedir\@^$(storedir)^g" \
 	 -e "s^@system\@^$(system)^g" \
 	 -e "s^@wget\@^$(wget)^g" \
+	 -e "s^@perl\@^$(perl)^g" \
 	 -e "s^@version\@^$(VERSION)^g" \
 	 < $< > $@ || rm $@
 	if test -x $<; then chmod +x $@; fi