CHECK_FUNCTION_EXISTS(nanosleep HAVE_NANOSLEEP)
CHECK_FUNCTION_EXISTS(getdtablesize HAVE_GETDTABLESIZE)
CHECK_FUNCTION_EXISTS(sysconf HAVE_SYSCONF)
-CHECK_FUNCTION_EXISTS(readv HAVE_READV)
CHECK_FUNCTION_EXISTS(popen HAVE_POPEN)
-CHECK_FUNCTION_EXISTS(signal HAVE_SIGNAL)
CHECK_SYMBOL_EXISTS(snprintf stdio.h HAVE_SNPRINTF)
CHECK_SYMBOL_EXISTS(vsnprintf stdio.h HAVE_VSNPRINTF)