tdb: fix install_name on Darwin

pkgs/development/libraries/tdb/default.nix

@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "mirror://samba/tdb/${pname}-${version}.tar.gz";
-    sha256 = "sha256-hDTJyFfRPOP6hGb3VgHyXDaTZ2s2kZ8VngrWEhuvXOg=";
+    hash = "sha256-hDTJyFfRPOP6hGb3VgHyXDaTZ2s2kZ8VngrWEhuvXOg=";
   };
 
   nativeBuildInputs = [
@@ -48,6 +48,10 @@ stdenv.mkDerivation rec {
     "--builtin-libraries=replace"
   ];
 
+  postFixup = if stdenv.isDarwin
+    then ''install_name_tool -id $out/lib/libtdb.dylib $out/lib/libtdb.dylib''
+    else null;
+
   # python-config from build Python gives incorrect values when cross-compiling.
   # If python-config is not found, the build falls back to using the sysconfig
   # module, which works correctly in all cases.