--- bdwgc/configure.ac.orig	2022-01-02 10:17:27.670680925 +0100

+++ bdwgc/configure.ac	2022-01-02 10:19:10.029685443 +0100

@@ -206,7 +206,7 @@

       *-*-aix* | *-*-android* | *-*-cygwin* | *-*-darwin* | *-*-dragonfly* | \

       *-*-freebsd* | *-*-haiku* | *-*-hpux11* | *-*-irix* | \

       *-*-kfreebsd*-gnu | *-*-gnu* | *-*-*linux* | *-*-msys* | *-*-nacl* | \

-      *-*-netbsd* | *-*-openbsd* | *-*-osf* | *-*-solaris*)

+      *-*-netbsd* | *-*-openbsd* | *-*-osf* | *-*-solaris* | *-*-midipix*)

         AC_DEFINE(GC_THREADS)

         AC_DEFINE([_REENTRANT], [1],

                   [Required define if using POSIX threads.])

@@ -252,6 +252,10 @@

         THREADDLLIBS=""

         win32_threads=true

         ;;

+      *-*-midipix*)

+        # libpthread is part of libc

+        THREADDLLIBS=""

+        ;;

       *-*-mingw*)

         AC_DEFINE(GC_WIN32_PTHREADS)

         # Using pthreads-win32 (or other non-Cygwin pthreads) library.