ftp/curl without GSSAPI

[Lena at lena.kiev.ua]

In `man curl`:

       --krb <level>
              (FTP) Enable Kerberos authentication and use. The level must  be
              entered and should be one of 'clear', 'safe', 'confidential', or
              'private'. Should you use a level that  is  not  one  of  these,
              'private' will instead be used.

              This  option  requires  a library built with kerberos4 or GSSAPI
              (GSS-Negotiate) support. This is not very common. Use -V, --ver-
              sion to see if your curl supports it.

~ $ curl -V
curl 7.35.0 (i386-portbld-freebsd8.4) libcurl/7.35.0 OpenSSL/1.0.1f zlib/1.2.3 libssh2/1.4.3
Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp scp sftp smtp smtps telnet tftp
Features: AsynchDNS Largefile NTLM NTLM_WB SSL libz TLS-SRP
~ $

`make config` offers choice of GSSAPI support via
base system, security/heimdal and security/krb5.
The "base system" option was always selected.
I use 8.4-RELEASE i386, its base doesn't contain libgssapi.
curl versions up to and including 7.35.0 worked without GSSAPI
(which I needn't). Fresh curl (7.36.0) fails to build:

--->  Upgrading 'curl-7.35.0' to 'curl-7.36.0' (ftp/curl)
...
===>   curl-7.36.0 depends on file: /usr/local/lib/libcrypto.so.8 - found
===>   curl-7.36.0 depends on file: /usr/local/bin/perl5.16.3 - found
===>   curl-7.36.0 depends on shared library: libssh2.so - found
 - found
===>  Configuring for curl-7.36.0
...
checking run-time libs availability... failed
configure: error: one or more libs available at link-time are not available run-time. Libs used at link-time: -lssh2 -lgssapi -lz
===>  Script "configure" failed unexpectedly.
Please report the problem to sunpoet at FreeBSD.org [maintainer] and attach the
"/usr/ports/ftp/curl/work/curl-7.36.0/config.log" including the output of the
failure of your make command. Also, it might be a good idea to provide an
overview of all packages installed on your system (e.g. a /usr/sbin/pkg_info
-Ea).
*** Error code 1
Stop in /usr/ports/ftp/curl.

How to force curl 7.36.0 to build without GSSAPI?