Created attachment 922742 [details]
Dummy project CMake file

Description of problem:
The installed CMake config files for the QtGui component are broken. 

Version-Release number of selected component:
At least qt5-qtbase-devel-5.3.1-5.fc20.x86_64, posibly older.

How reproducible:
Every time.

Steps to Reproduce:
1. Create a dummy CMakeLists.txt file in a directory "source":
----------BEGIN CMakeLists.txt--------
cmake_minimum_required(VERSION 2.8.12)
project(TestQT5)
find_package(Qt5 REQUIRED Gui)
----------END CMakeLists.txt----------

2. From a seperate build directory, run cmake:
$ cd build/
$ /usr/bin/cmake ../source

Actual results:
$ /usr/bin/cmake ../source
...
CMake Error at /usr/lib64/cmake/Qt5Gui/Qt5GuiConfig.cmake:15 (message):
  The imported target "Qt5::Gui" references the file

     "Qt5Gui_EGL_LIBRARY-NOTFOUND"

  but this file does not exist.  Possible reasons include:
...
-- Configuring incomplete, errors occurred!

Expected results:
$ /usr/bin/cmake ../source
-- The C compiler identification is GNU 4.8.3
-- The CXX compiler identification is GNU 4.8.3
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
-- Generating done

Additional info:
The underlying problem apears to be that the macros in Qt5GuiConfigExtras.cmake are making some assumptions about the existence of libraries.  This can be fixed with a trivial path to check that the libraries were successfully found before attempting to use them:

BEGIN PATCH
--- /usr/lib64/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake	2014-07-30 17:30:01.956232844 -0400
+++ /usr/lib64/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake.fixed	2014-07-30 17:30:12.348200201 -0400
@@ -23,7 +23,7 @@
                 set(_Qt5Gui_${_cmake_lib_name}_LIBRARY_DONE TRUE)
                 unset(Qt5Gui_${_cmake_lib_name}_LIBRARY CACHE)
                 list(APPEND Qt5Gui_${Name}_LIBRARIES ${_lib})
-            else ()
+            elseif (Qt5Gui_${_cmake_lib_name}_LIBRARY)
                 add_library(Qt5::Gui_${_cmake_lib_name} SHARED IMPORTED)
                 set_property(TARGET Qt5::Gui_${_cmake_lib_name} APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${Qt5Gui_${Name}_INCLUDE_DIRS})
END PATCH