--- a/redo/jobserver.py	2021-07-28 05:48:36.000000000 +0200
+++ b/redo/jobserver.py	2026-10-17 20:19:12.540326252 +0200
@@ -227,9 +227,16 @@ def setup(maxjobs):
     if ofs >= 0:
         s = flags[ofs+len(FIND):]
         (arg, junk) = s.split(' ', 1)
-        (a, b) = arg.split(',', 1)
-        a = atoi(a)
-        b = atoi(b)
+        if arg.startswith('fifo:'):
+            # GNU make 4.4 passes a named pipe instead of fds
+            fd = os.open(arg[5:], os.O_RDWR)
+            a = fcntl.fcntl(fd, fcntl.F_DUPFD, 100)
+            b = fcntl.fcntl(fd, fcntl.F_DUPFD, 101)
+            os.close(fd)
+        else:
+            (a, b) = arg.split(',', 1)
+            a = atoi(a)
+            b = atoi(b)
         if a <= 0 or b <= 0:
             logs.err('invalid --jobserver-auth: %r\n' % arg)
             raise helpers.ImmediateReturn(200)