make/autoconf/basics.m4

@@ -888,10 +888,12 @@
         if test "x$OPENJDK_BUILD_OS" = "xwindows"; then
           if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.cygwin"; then
             MAKE_EXPECTED_ENV='cygwin'
           elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys"; then
             MAKE_EXPECTED_ENV='msys'
+          elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl"; then
+            MAKE_EXPECTED_ENV='.'
           else
             AC_MSG_ERROR([Unknown Windows environment])
           fi
           MAKE_BUILT_FOR=`$MAKE_CANDIDATE --version | $GREP -i 'built for'`
           IS_MAKE_CORRECT_ENV=`$ECHO $MAKE_BUILT_FOR | $GREP $MAKE_EXPECTED_ENV`