AM_PROG_CC_C_O
+dnl If the host is Windows, define _WIN32_WINNT to a suitable value.
+AC_CANONICAL_HOST
+case $host in
+ *mingw*|*cygwin*|*win32*) CFLAGS="$CFLAGS -D_WIN32_WINNT=0x0500" ;;
+esac
+
dnl Check support for 64 bit file offsets.
AC_SYS_LARGEFILE