This file is part of mingw-cross-env. See doc/index.html for further information. This patch has been taken from: http://trac.osgeo.org/proj/ticket/56 http://trac.osgeo.org/proj/changeset/1790 --- proj/src/pj_mutex.c (revision 1788) +++ proj/src/pj_mutex.c (revision 1790) @@ -38,6 +38,8 @@ #endif -#ifdef _WIN32 +/* on win32 we always use win32 mutexes, even if pthreads are available */ +#if defined(_WIN32) && !defined(MUTEX_stub) # define MUTEX_win32 +# undef MUTEX_pthread #endif