Merge: make dev output references explicit

This is a rebase of most commits from #14766,
resolving conflicts and a few other evaluation problems.

pkgs/tools/backup/bacula/default.nix

@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
     ++ stdenv.lib.optional (!stdenv.isDarwin) acl;
 
   configureFlags = [ 
-    "--with-sqlite3=${sqlite}" 
+    "--with-sqlite3=${sqlite.dev}"
     "--with-postgresql=${postgresql}"
   ];