nixos: add bird module

patch bird to look in /var/run for birc.ctl

pkgs/servers/bird/default.nix

@@ -10,6 +10,14 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ flex bison readline ];
 
+  patches = [
+    ./dont-create-sysconfdir.patch
+  ];
+
+  configureFlags = [
+    "--localstatedir /var"
+  ];
+
   meta = {
     description = "BIRD Internet Routing Daemon";
     homepage = http://bird.network.cz;

pkgs/servers/bird/dont-create-sysconfdir.patch

@@ -0,0 +1,13 @@
+diff --git a/tools/Makefile.in b/tools/Makefile.in
+index 062ba91..4fd7453 100644
+--- a/tools/Makefile.in
++++ b/tools/Makefile.in
+@@ -68,7 +68,7 @@ tags:
+ 	cd $(srcdir) ; etags -lc `find $(static-dirs) $(addprefix $(objdir)/,$(dynamic-dirs)) $(client-dirs) -name *.[chY]`
+ 
+ install: all
+-	$(INSTALL) -d $(DESTDIR)/$(sbindir) $(DESTDIR)/$(sysconfdir) $(DESTDIR)/@runtimedir@
++	$(INSTALL) -d $(DESTDIR)/$(sbindir) $(DESTDIR)/$(sysconfdir)
+ 	$(INSTALL_PROGRAM) $(exedir)/bird $(DESTDIR)/$(sbindir)/bird@SUFFIX@
+ 	$(INSTALL_PROGRAM) $(exedir)/birdcl $(DESTDIR)/$(sbindir)/birdcl@SUFFIX@
+ 	if test -n "@CLIENT@" ; then								\