if(HAVE_MAKECONTEXT OR WIN32)
set(makecontext_CPPFLAGS "-DTEST_makecontext")
if(CMAKE_SYSTEM_NAME MATCHES "Darwin")
- set(makecontext_CPPFLAGS_2 "-DOSX")
+ set(makecontext_CPPFLAGS_2 "-D_XOPEN_SOURCE")
endif(CMAKE_SYSTEM_NAME MATCHES "Darwin")
if(WIN32 AND __VISUALC__)