diff -rup a/src/main.c b/src/main.c --- a/src/main.c 2022-10-24 02:22:00.000000000 -0400 +++ b/src/main.c 2022-11-01 17:31:41.072952404 -0400 @@ -2195,6 +2195,21 @@ main (int argc, char **argv, char **envp } #endif +#ifdef PIPE_BUF + if (job_slots > PIPE_BUF) +#elif defined _POSIX_PIPE_BUF + if (job_slots > _POSIX_PIPE_BUF) +#else + if (job_slots > 512) +#endif + { + O (error, NILF, + _("More parallel jobs (-jN) than this platform can handle requested.")); + O (error, NILF, _("Resetting to single job (-j1) mode.")); + job_slots = 1; + } + + /* If we have >1 slot at this point, then we're a top-level make. Set up the jobserver.