win32-uname.[ch] were renamed in Guile 2.0.12, but configure.ac still references them:
case $host in
*-*-mingw*)
AC_CHECK_HEADER(winsock2.h, [AC_DEFINE([HAVE_WINSOCK2_H], 1,
[Define if you have the <winsock2.h> header file.])])
AC_CHECK_LIB(ws2_32, main)
AC_LIBOBJ([win32-uname]) <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
This causes a fatal error during the build with MinGW.
