use a separate directory for compiling and for editing source code as per the following:

AC_DEFUN([ACE_CHECK_FOR_CVS_DIR],

[

 if test -d CVS; then

   AC_MSG_ERROR(

     [

      This error is meant for maintainers:



      Please configure and build in a non-CVS controlled directory.

      Doing so will prevent accidentally committing automatically

      generated files into the CVS repository and help ensure that

      the generated files and build scheme are correct.



      For example, try the following from the top-level source

      directory:



          mkdir objdir

          cd objdir

          ../configure

          make



      This will create a build space in the directory `objdir' and

      start a build in that directory.

     ])

 fi

])