libmms version: 0.6.2
Compiling with: i686-w64-mingw32-gcc (GCC) 4.6.3

Error Output:

make -C libmms
make[3]: Entering directory `/var/lib/jenkins/jobs/gst-plugins-bad/workspace/host_target/win32/ext/libmms'
  CC     libgstmms_la-gstmms.lo
gstmms.c: In function 'gst_mms_create':
gstmms.c:342:3: error: format '%I64i' expects argument of type 'long long int', but argument 8 has type 'off_t' [-Werror=format]
cc1: all warnings being treated as errors
make[3]: *** [libgstmms_la-gstmms.lo] Error 1

The line of code at fault:
GST_LOG_OBJECT (mmssrc, "Returning buffer with offset %" G_GINT64_FORMAT
      " and size %u", offset, result);