CHECK_INCLUDE_FILE("string.h" HAVE_STRING_H)
CHECK_INCLUDE_FILE("ucontext.h" HAVE_UCONTEXT_H)
CHECK_INCLUDE_FILE("stdio.h" HAVE_STDIO_H)
+CHECK_INCLUDE_FILE("linux/futex.h" HAVE_FUTEX_H)
+
CHECK_FUNCTION_EXISTS(gettimeofday HAVE_GETTIMEOFDAY)
CHECK_FUNCTION_EXISTS(usleep HAVE_USLEEP)