--- old/make/autoconf/basics_windows.m4	2018-01-23 23:09:24.894955200 +0900
+++ new/make/autoconf/basics_windows.m4	2018-01-23 23:09:24.261774300 +0900
@@ -353,8 +353,17 @@
     BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(MSYS_ROOT_PATH)
     AC_MSG_RESULT([$MSYS_ROOT_PATH])
     WINDOWS_ENV_ROOT_PATH="$MSYS_ROOT_PATH"
+  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl"; then
+    AC_MSG_CHECKING([wsl kernel])
+    WSL_KERNEL_VERSION=`$UNAME -r`
+    AC_MSG_RESULT([$WSL_KERNEL_VERSION])
+
+    WINDOWS_ENV_VENDOR='wsl'
+    WINDOWS_ENV_VERSION="$WSL_KERNEL_VERSION"
+
+    WINDOWS_ENV_ROOT_PATH="/mnt/c"
   else
-    AC_MSG_ERROR([Unknown Windows environment. Neither cygwin nor msys was detected.])
+    AC_MSG_ERROR([Unknown Windows environment: $OPENJDK_BUILD_OS_ENV ])
   fi
 
   # Test if windows or unix (cygwin/msys) find is first in path.