-if [ -z "$this_prefix" ]; then
- printf "\n *** Error: Directory '@abs_top_builddir@'\n" 1>&2
- printf " no longer exists.\n\n" 1>&2
- exit 1
-fi
+this_prefix=$(check_dirname "@abs_top_srcdir@") || exit
+this_exec_prefix=$(check_dirname "@abs_top_builddir@") || exit