* Fix spacing of --disable-ipv6 in autoconf

autotools/includes/acinclude.m4

@@ -30,7 +30,7 @@ dnl
 AC_DEFUN([EGG_IPV6_OPTIONS], 
 [
 AC_MSG_CHECKING(whether or not you disabled IPv6 support)
-AC_ARG_ENABLE(ipv6, [  --disable-ipv6           disable IPv6 support],
+AC_ARG_ENABLE(ipv6, [AS_HELP_STRING([--disable-ipv6], [disable IPv6 support])],
 [ ac_cv_dipv6="yes"
   AC_MSG_RESULT(yes)
 ],

configure

@@ -1305,7 +1305,7 @@ Optional Features:
   --disable-option-checking  ignore unrecognized --enable/--with options
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
-  --disable-ipv6           disable IPv6 support
+  --disable-ipv6          disable IPv6 support
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]