[CMake] information q&a

autoheader discussion
autoheader discussion - 2
CMake linking problem

some variable to notice:
CMAKE_EXE_LINKER_FLAGS

pkg-config usage:
g++ -Wall $(pkg-config --cflags --libs gstreamer-0.10) main.cpp -o MPEG4GStreamer

usage of FIND_PACKAGE_HANDLE_STANDARD_ARGS

Some files under /Modules to look into:
CMakePackageConfigHelpers.cmake
WriteBasicConfigVersionFile.cmake(obsolete)

some Findxxx.cmake files