bemenu: add darwin platform (#397591)

pkgs/by-name/be/bemenu/package.nix

···
   harfbuzz,
   pkg-config,
   scdoc,
+  makeWrapper,
   ncursesSupport ? true,
   ncurses,
-  waylandSupport ? true,
+  waylandSupport ? stdenv.hostPlatform.isLinux,
   wayland,
   wayland-protocols,
   wayland-scanner,
-  x11Support ? true,
+  x11Support ? stdenv.hostPlatform.isLinux,
   xorg,
 }:
 
···
     hash = "sha256-0vpqJ2jydTt6aVni0ma0g+80PFz+C4xJ5M77sMODkSg=";
   };
 
+  postPatch = lib.optionalString stdenv.hostPlatform.isDarwin ''
+    substituteInPlace GNUmakefile --replace '-soname' '-install_name'
+  '';
+
   strictDeps = true;
-  nativeBuildInputs = [
-    pkg-config
-    scdoc
-  ] ++ lib.optionals waylandSupport [ wayland-scanner ];
+  nativeBuildInputs =
+    [
+      pkg-config
+      scdoc
+    ]
+    ++ lib.optional stdenv.hostPlatform.isDarwin makeWrapper
+    ++ lib.optional waylandSupport wayland-scanner;
 
   buildInputs =
     [
···
     ++ lib.optional waylandSupport "wayland"
     ++ lib.optional x11Support "x11";
 
+  postInstall = lib.optionalString stdenv.hostPlatform.isDarwin ''
+    so="$(find "$out/lib" -name "libbemenu.so.[0-9]" -print -quit)"
+    for f in "$out/bin/"*; do
+        install_name_tool -change "$(basename $so)" "$so" $f
+        wrapProgram $f --set BEMENU_BACKEND curses
+    done
+  '';
+
   meta = with lib; {
     homepage = "https://github.com/Cloudef/bemenu";
     description = "Dynamic menu library and client program inspired by dmenu";
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ crertel ];
     mainProgram = "bemenu";
-    platforms = with platforms; linux;
+    platforms = with platforms; linux ++ darwin;
   };
 })