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
])