[CMake] find_package failing with Ninja

[Michael Sartain]

I'm hitting this is on 64-bit Linux (Ubuntu 12.04).

Simple CMakeLists.txt file:
  cmake_minimum_required(VERSION 2.8)
  project(Blah)
  find_package(OpenGL REQUIRED)
  message("OPENGL_INCLUDE_DIRS is ${OPENGL_INCLUDE_DIRS}")
  message("OPENGL_LIBRARIES is ${OPENGL_LIBRARIES}")

Doing a regular "cmake .." works, but adding "-G Ninja" fails:

mikesart at mikesart64:~/data/src/bin64/Debug$ cmake .. -G Ninja
-- The C compiler identification is Clang 3.3.0
-- Check for working C compiler using: Ninja
-- Check for working C compiler using: Ninja -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- The CXX compiler identification is Clang 3.3.0
-- Check for working CXX compiler using: Ninja
-- Check for working CXX compiler using: Ninja -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
CMake Error at
/usr/local/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:97
(message):
  Could NOT find OpenGL (missing: OPENGL_gl_LIBRARY)
Call Stack (most recent call first):

/usr/local/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:291
(_FPHSA_FAILURE_MESSAGE)
  /usr/local/share/cmake-2.8/Modules/FindOpenGL.cmake:153
(FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:10 (find_package)
-- Configuring incomplete, errors occurred!

If I explicitly set CMAKE_LIBRARY_ARCHITECTURE it will succeed:

cmake .. -G Ninja -DCMAKE_LIBRARY_ARCHITECTURE="x86_64-linux-gnu"

If anyone has any suggestions on better ways around this issue, I'd love to
hear them. Thanks much.
 -Mike
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