AC_CACHE_CHECK([for vcs checkout],[ac_cv_vcs_checkout],
[AS_IF([test "x$ac_cv_vcs_system" != "xnone"],
[ac_cv_vcs_checkout=yes],
AC_CACHE_CHECK([for vcs checkout],[ac_cv_vcs_checkout],
[AS_IF([test "x$ac_cv_vcs_system" != "xnone"],
[ac_cv_vcs_checkout=yes],