freeglut: import from homebrew/x11.

Formula/freeglut.rb

@@ -0,0 +1,46 @@
+class Freeglut < Formula
+  desc "Open-source alternative to the OpenGL Utility Toolkit (GLUT) library"
+  homepage "http://freeglut.sourceforge.net/"
+  url "https://downloads.sourceforge.net/project/freeglut/freeglut/3.0.0/freeglut-3.0.0.tar.gz"
+  sha256 "2a43be8515b01ea82bcfa17d29ae0d40bd128342f0930cd1f375f1ff999f76a2"
+
+  depends_on :x11
+  depends_on "cmake" => :build
+
+  patch :DATA
+
+  def install
+    inreplace "src/x11/fg_main_x11.c", "CLOCK_MONOTONIC", "UNDEFINED_GIBBERISH"
+    system "cmake", "-D", "FREEGLUT_BUILD_DEMOS:BOOL=OFF", "-D", "CMAKE_INSTALL_PREFIX:PATH=#{prefix}", "."
+    system "make", "all"
+    system "make", "install"
+  end
+
+  test do
+    system "#{bin}/freeglut", "--version"
+  end
+end
+
+__END__
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 28f8651..d1f6a86 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -220,6 +220,16 @@
+ IF(FREEGLUT_GLES)
+   ADD_DEFINITIONS(-DFREEGLUT_GLES)
+   LIST(APPEND LIBS GLESv2 GLESv1_CM EGL)
++ELSEIF(APPLE)
++  # on OSX FindOpenGL uses framework version of OpenGL, but we need X11 version
++  FIND_PATH(GLX_INCLUDE_DIR GL/glx.h
++            PATHS /opt/X11/include /usr/X11/include /usr/X11R6/include)
++  FIND_LIBRARY(OPENGL_gl_LIBRARY GL
++               PATHS /opt/X11/lib /usr/X11/lib /usr/X11R6/lib)
++  FIND_LIBRARY(OPENGL_glu_LIBRARY GLU
++               PATHS /opt/X11/lib /usr/X11/lib /usr/X11R6/lib)
++  LIST(APPEND LIBS ${OPENGL_gl_LIBRARY})
++  INCLUDE_DIRECTORIES(${GLX_INCLUDE_DIR})
+ ELSE()
+   FIND_PACKAGE(OpenGL REQUIRED)
+   LIST(APPEND LIBS ${OPENGL_gl_LIBRARY})