highlight: remove with lib; convert prePatch to postPatch

pkgs/tools/text/highlight/default.nix

@@ -1,7 +1,5 @@
 { lib, stdenv, fetchFromGitLab, getopt, lua, boost, pkg-config, swig, perl, gcc }:
 
-with lib;
-
 let
   self = stdenv.mkDerivation rec {
     pname = "highlight";
@@ -16,11 +14,12 @@ let
 
     enableParallelBuilding = true;
 
-    nativeBuildInputs = [ pkg-config swig perl ] ++ optional stdenv.isDarwin gcc;
+    nativeBuildInputs = [ pkg-config swig perl ]
+      ++ lib.optional stdenv.isDarwin gcc;
 
     buildInputs = [ getopt lua boost ];
 
-    prePatch = ''
+    postPatch = ''
       substituteInPlace src/makefile \
         --replace "shell pkg-config" "shell $PKG_CONFIG"
       substituteInPlace makefile \
@@ -36,15 +35,15 @@ let
 
     # This has to happen _before_ the main build because it does a
     # `make clean' for some reason.
-    preBuild = optionalString (!stdenv.isDarwin) ''
+    preBuild = lib.optionalString (!stdenv.isDarwin) ''
       make -C extras/swig $makeFlags perl
     '';
 
-    postCheck = optionalString (!stdenv.isDarwin) ''
+    postCheck = lib.optionalString (!stdenv.isDarwin) ''
       perl -Iextras/swig extras/swig/testmod.pl
     '';
 
-    preInstall = optionalString (!stdenv.isDarwin) ''
+    preInstall = lib.optionalString (!stdenv.isDarwin) ''
       mkdir -p $out/${perl.libPrefix}
       install -m644 extras/swig/highlight.{so,pm} $out/${perl.libPrefix}
       make -C extras/swig clean # Clean up intermediate files.