fltk14: add wayland support

pkgs/development/libraries/fltk/1.4.nix

@@ -34,12 +34,21 @@
 
   withXorg ? stdenv.hostPlatform.isLinux,
 
+  withWayland ? stdenv.hostPlatform.isLinux && withCairo,
+  wayland,
+  wayland-protocols,
+  libxkbcommon,
+  wayland-scanner,
+
   withExamples ? (stdenv.buildPlatform == stdenv.hostPlatform),
 }:
 
 # pango support depends on Xft
 assert withPango -> withXorg;
 
+# wayland support depends on cairo
+assert withWayland -> withCairo;
+
 stdenv.mkDerivation (finalAttrs: {
   pname = "fltk";
   version = "1.4.4";
@@ -64,6 +73,9 @@ stdenv.mkDerivation (finalAttrs: {
     cmake
     pkg-config
   ]
+  ++ lib.optionals withWayland [
+    wayland-scanner
+  ]
   ++ lib.optionals withDocs [
     doxygen
     graphviz
@@ -98,6 +110,11 @@ stdenv.mkDerivation (finalAttrs: {
     libXft
     libXrender
   ]
+  ++ lib.optionals withWayland [
+    wayland
+    wayland-protocols
+    libxkbcommon
+  ]
   ++ lib.optionals withCairo [
     cairo
   ]
@@ -120,6 +137,9 @@ stdenv.mkDerivation (finalAttrs: {
     (lib.cmakeBool "FLTK_USE_XFT" withXorg)
     (lib.cmakeBool "FLTK_USE_XRENDER" withXorg)
 
+    # Wayland
+    (lib.cmakeBool "FLTK_BACKEND_WAYLAND" withWayland)
+
     # GL
     (lib.cmakeBool "FLTK_BUILD_GL" withGL)