diff -r 0389cfac44bb -r 5f3f7ae12356 common/autoconf/basics_windows.m4
--- a/common/autoconf/basics_windows.m4	Thu Jul 06 20:13:39 2017 +0000
+++ b/common/autoconf/basics_windows.m4	Fri Jul 07 03:09:23 2017 +0000
@@ -329,8 +329,8 @@
       AC_MSG_ERROR([Something is wrong with your cygwin installation since I cannot find cygpath.exe in your path])
     fi
     AC_MSG_CHECKING([cygwin root directory as unix-style path])
-    # The cmd output ends with Windows line endings (CR/LF), the grep command will strip that away
-    cygwin_winpath_root=`cd / ; cmd /c cd | $GREP ".*"`
+    # The cmd output ends with Windows line endings (CR/LF)
+    cygwin_winpath_root=`cd / ; cmd /c cd | $TR -d '\r\n'`
     # Force cygpath to report the proper root by including a trailing space, and then stripping it off again.
     CYGWIN_ROOT_PATH=`$CYGPATH -u "$cygwin_winpath_root " | $CUT -f 1 -d " "`
     AC_MSG_RESULT([$CYGWIN_ROOT_PATH])