--- old/make/autoconf/basics.m4	2018-01-23 23:09:20.455242500 +0900
+++ new/make/autoconf/basics.m4	2018-01-23 23:09:19.784921200 +0900
@@ -890,6 +890,8 @@
             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