--- protobuf/m4/acx_pthread.m4.orig	2022-02-23 11:15:51.818483000 +0100
+++ protobuf/m4/acx_pthread.m4	2022-02-23 11:16:06.148340600 +0100
@@ -134,6 +134,10 @@ case "${host_cpu}-${host_os}" in
 
         acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
         ;;
+        *mingw*)
+        # Do not use pthread, fallback to the win32 threading API
+        acx_pthread_flags=""
+        ;;
 esac
 
 if test x"$acx_pthread_ok" = xno; then