This was causing "--without-gnome-proxy" to be treated as
"--with-gnome-proxy=check".
https://bugzilla.gnome.org/show_bug.cgi?id=662203
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AC_ARG_WITH(gnome-proxy,
[AC_HELP_STRING([--with-gnome-proxy],
- [support for GNOME proxy configuration @<:@default=check@:>@])]
+ [support for GNOME proxy configuration @<:@default=check@:>@])],
[],
[with_gnome_proxy=check])
AS_IF([test "x$with_gnome_proxy" != "xno"],