if (WIN32)
# http://msdn.microsoft.com/en-us/library/aa383745.aspx
- add_definitions (-D_WIN32_WINNT=0x0501 -DWINVER=0x0501)
+ add_definitions (-D_WIN32_WINNT=0x0601 -DWINVER=0x0601)
else (WIN32)
CHECK_CXX_COMPILER_FLAG("-fvisibility=hidden" CXX_COMPILER_FLAG_VISIBILITY)
if (CXX_COMPILER_FLAG_VISIBILITY)