cmake OPENEXR_IMF_HAVE_SYSCONF_NPROCESSORS_ONLN examples

AcademySoftwareFoundation/openexr cmake/CMakeLists.txt :20 

check_cxx_source_compiles(
"
#include <unistd.h>
int main()
{
    sysconf(_SC_NPROCESSORS_ONLN);
}
" OPENEXR_IMF_HAVE_SYSCONF_NPROCESSORS_ONLN
)