dnl as-ac-expand.m4 0.2.0dnl autostars m4 macro for expanding directories using configure's prefixdnl thomas@apestaart.orgdnl AS_AC_EXPAND(VAR, CONFIGURE_VAR)dnl examplednl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir)dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/localAC_DEFUN([AS_AC_EXPAND],[  EXP_VAR=[$1]  FROM_VAR=[$2]  dnl first expand prefix and exec_prefix if necessary  prefix_save=$prefix  exec_prefix_save=$exec_prefix  dnl if no prefix given, then use /usr/local, the default prefix  if test "x$prefix" = "xNONE"; then    prefix="$ac_default_prefix"  fi  dnl if no exec_prefix given, then use prefix  if test "x$exec_prefix" = "xNONE"; then    exec_prefix=$prefix  fi  full_var="$FROM_VAR"  dnl loop until it doesn't change anymore  while true; do    new_full_var="`eval echo $full_var`"    if test "x$new_full_var" = "x$full_var"; then break; fi    full_var=$new_full_var  done  dnl clean up  full_var=$new_full_var  AC_SUBST([$1], "$full_var")  dnl restore prefix and exec_prefix  prefix=$prefix_save  exec_prefix=$exec_prefix_save])