gnuplot_qt: Qt 4 -> Qt 5

pkgs/tools/graphics/gnuplot/default.nix

···
 , fontconfig ? null
 , gnused ? null
 , coreutils ? null
-, withQt ? false, qt }:
+, withQt ? false, qttools, qtbase, qtsvg
+}:
 
 assert libX11 != null -> (fontconfig != null && gnused != null && coreutils != null);
 let
···
     sha256 = "18diyy7aib9mn098x07g25c7jij1x7wbfpicz0z8gwxx08px45m4";
   };
 
-  nativeBuildInputs = [ makeWrapper pkgconfig texinfo ];
+  nativeBuildInputs = [ makeWrapper pkgconfig texinfo ] ++ lib.optional withQt qttools;
 
   buildInputs =
     [ cairo gd libcerf pango readline zlib ]
     ++ lib.optional withTeXLive (texlive.combine { inherit (texlive) scheme-small; })
     ++ lib.optional withLua lua
     ++ lib.optionals withX [ libX11 libXpm libXt libXaw ]
-    ++ lib.optional withQt qt
-    # compiling with wxGTK causes a malloc (double free) error on darwin
-    ++ lib.optional (withWxGTK && !stdenv.isDarwin) wxGTK;
+    ++ lib.optionals withQt [ qtbase qtsvg ]
+    ++ lib.optional withWxGTK wxGTK;
 
-  configureFlags =
-    (if withX then ["--with-x"] else ["--without-x"])
-    ++ (if withQt then ["--enable-qt"] else ["--disable-qt"])
-    ++ (if aquaterm then ["--with-aquaterm"] else ["--without-aquaterm"]);
+  postPatch = ''
+    # lrelease is in qttools, not in qtbase.
+    substituteInPlace configure --replace '$'{QT5LOC}/lrelease lrelease
+  '';
+
+  configureFlags = [
+    (if withX then "--with-x" else "--without-x")
+    (if withQt then "--with-qt=qt5" else "--without-qt")
+    (if aquaterm then "--with-aquaterm" else "--without-aquaterm")
+  ];
 
   postInstall = lib.optionalString withX ''
     wrapProgram $out/bin/gnuplot \

pkgs/top-level/all-packages.nix

···
   };
   gnupg = gnupg22;
 
-  gnuplot = callPackage ../tools/graphics/gnuplot { qt = qt4; };
+  gnuplot = libsForQt5.callPackage ../tools/graphics/gnuplot { };
 
   gnuplot_qt = gnuplot.override { withQt = true; };