cmake GDCM_HAVE_BYTESWAP_H examples

malaterre/GDCM Source/Common/CMakeLists.txt :27 

CHECK_CXX_SOURCE_COMPILES(
    "\#include <byteswap.h>\nint main() { return bswap_32( 42 ); }"
    GDCM_HAVE_BYTESWAP_H)

InsightSoftwareConsortium/ITK Modules/ThirdParty/GDCM/src/gdcm/Source/Common/CMakeLists.txt :27 

CHECK_CXX_SOURCE_COMPILES(
    "\#include <byteswap.h>\nint main() { return bswap_32( 42 ); }"
    GDCM_HAVE_BYTESWAP_H)