diff --git a/configure.in b/configure.in
index 61a0fc8649..05ec2ccb96 100644
--- a/configure.in
+++ b/configure.in
@@ -746,6 +746,13 @@ fi
 
 AC_PROG_CPP
 
+dnl ----------------------------------------------------------------
+dnl Checks for Windows NT
+case $host_os in
+  *mingw32* ) ac_cv_mingw32=yes ;;
+  *cygwin* ) ac_cv_cygwin=yes ;;
+esac
+
 dnl ----------------------------------------------------------------
 dnl Checks for file extensions
 AC_EXEEXT