Minor issue with CMake 2.8.12 when trying to find the Qt5Widgets package

I have just upgraded to CMake 2.8.12, while still using Qt 5.1.1 on OS X 10.8.5, and one of my CMake commands is:

FIND_PACKAGE(Qt5Widgets REQUIRED)

Using CMake 2.8.11, everything used to work fine. However, with CMake 2.8.12, I am now getting the following warning:

~~~~~~~~~
CMake Warning (dev) at /Applications/Qt/5.1.1/clang_64/lib/cmake/Qt5Gui/Qt5GuiConfig.cmake:123 (include):
Syntax Warning in cmake code at

/Applications/Qt/5.1.1/clang_64/lib/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:8:56

Argument not separated from preceding token by whitespace.
Call Stack (most recent call first):
/Applications/Qt/5.1.1/clang_64/lib/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake:78 (find_package)
cmake/common.cmake:17 (FIND_PACKAGE)
CMakeLists.txt:27 (INITIALISE_PROJECT)
This warning is for project developers. Use -Wno-dev to suppress it.
~~~~~~~~~

I am still able to build my project, so it's not a blocking issue. Still, it would be nice to fix it.

As it happens, I had a look at Qt5GuiConfigExtras.cmake and line 8 refers to the following command:

message(FATAL_ERROR "Failed to find \"gl.h\" in \""/System/Library/Frameworks/OpenGL.framework/Headers" "/System/Library/Frameworks/AGL.framework/Headers"\".")

For some reasons, CMake 2.8.12 wants a space between the two double quotes, i.e.

message(FATAL_ERROR "Failed to find \"gl.h\" in \" "/System/Library/Frameworks/OpenGL.framework/Headers" "/System/Library/Frameworks/AGL.framework/Headers"\".")

So, that would fix the warning reported above. However, a better solution might be:

message(FATAL_ERROR "Failed to find \"gl.h\" in \"/System/Library/Frameworks/OpenGL.framework/Headers\" \"/System/Library/Frameworks/AGL.framework/Headers\".")

Indeed, the result of the original CMake command is as follows (notice the final full point in double quotes):

~~~~~~~~~
CMake Error at /Applications/Qt/5.1.1/clang_64/lib/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:8 (message):
Failed to find "gl.h" in
"/System/Library/Frameworks/OpenGL.framework/Headers"
"/System/Library/Frameworks/AGL.framework/Headers""."
~~~~~~~~~

while 'my' solution results in the following message:

~~~~~~~~~
CMake Error at /Applications/Qt/5.1.1/clang_64/lib/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:8 (message):
Failed to find "gl.h" in
"/System/Library/Frameworks/OpenGL.framework/Headers"
"/System/Library/Frameworks/AGL.framework/Headers".
~~~~~~~~~