make/autoconf/basics.m4

*** 888,897 ****
--- 888,899 ----
          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`