* configure.in (--enable-add-ons): Quote m4 macro args.
dnl Generic infrastructure for drop-in additions to libc.
AC_ARG_ENABLE(add-ons, dnl
[ --enable-add-ons=DIR... configure and build named extra directories],
- add_ons=`echo "$enableval" | sed 's/,/ /g'`,
- add_ons=)
+ [add_ons=`echo "$enableval" | sed 's/,/ /g'`],
+ [add_ons=])
AC_CONFIG_SUBDIRS($add_ons)
AC_CANONICAL_HOST