AC_DEFUN([AC_INSTALL_PREFIX],
[ac_cv_install_prefix="$prefix";
if test x"$ac_cv_install_prefix" = x"NONE" ; then
ac_cv_install_prefix="$ac_default_prefix";
fi
AC_DEFINE_UNQUOTED(INSTALL_PREFIX, "$ac_cv_install_prefix",
[prefix where we look for installed files])
])