AC_DEFUN([AC_ESPIK_VERSION],
[
  AC_MSG_CHECKING(for git commit)

  if test `eval git hash-object .git/HEAD`; then
    GITVERSION=`git hash-object .git/HEAD`
  else
    GITVERSION=`date +%Y%m%d`
  fi

  AC_MSG_RESULT($GITVERSION)

  AC_SUBST(GITVERSION)
])