* Generate the scripts so that we can substitute the prefix

etc. correctly.
* Fixed nix-switch.

scripts/Makefile.am

@@ -1,9 +1,19 @@
 bin_SCRIPTS = nix-switch nix-collect-garbage \
  nix-pull nix-push
 
+noinst_SCRIPTS = nix-profile.sh
+
 install-exec-local:
 	$(INSTALL) -d $(sysconfdir)/profile.d
 	$(INSTALL_PROGRAM) nix-profile.sh $(sysconfdir)/profile.d/nix.sh
 	$(INSTALL) -d $(sysconfdir)/nix
 # !!! don't overwrite local modifications
 	$(INSTALL_DATA) prebuilts.conf $(sysconfdir)/nix/prebuilts.conf
+
+%: %.in Makefile
+	sed \
+	 -e s^@prefix\@^$(prefix)^g \
+	 -e s^@sysconfdir\@^$(sysconfdir)^g \
+	 -e s^@localstatedir\@^$(localstatedir)^g \
+	 < $< > $@ || rm $@
+	chmod +x $@