firefox-1.0.6_5,1 upgrade fails

[jd]

I'm trying to upgrade firefox-1.0.6_5,1 to 1.0.7_4,1 and portupgrade
fails with this error:

/usr/include/gssapi.h:405:1: warning: this is the location of the
previous definition
gmake[3]: *** [nsNegotiateAuthFactory.o] Error 1
gmake[3]: Leaving directory
`/usr/ports/www/firefox/work/mozilla/extensions/negotiateauth'
gmake[2]: *** [libs] Error 2
gmake[2]: Leaving directory
`/usr/ports/www/firefox/work/mozilla/extensions'
gmake[1]: *** [tier_94] Error 2
gmake[1]: Leaving directory `/usr/ports/www/firefox/work/mozilla'
gmake: *** [default] Error 2
*** Error code 2

Stop in /usr/ports/www/firefox.
** Command failed [exit code 1]: /usr/bin/script -qa
/tmp/portupgrade29476.0 make
** Fix the problem and try again.
--->  Build of www/firefox ended at: Mon, 28 Nov 2005 17:52:47 -0500
(consumed 01:26:28)
--->  Upgrade of www/firefox ended at: Mon, 28 Nov 2005 17:52:48 -0500
(consumed 01:26:28)
--->  Listing the results (+:done / -:ignored / *:skipped / !:failed)
        - lang/perl5.8 (perl-5.8.7)
        - graphics/png (png-1.2.8_2)
        - converters/libiconv (libiconv-1.9.2_1)
        - graphics/jpeg (jpeg-6b_3)
        - devel/gettext (gettext-0.14.5)
        - devel/nspr (nspr-4.6_1)
        - devel/popt (popt-1.7)
        - devel/pkgconfig (pkgconfig-0.20)
        - devel/glib20 (glib-2.8.4)
        - accessibility/atk (atk-1.10.3)
        - print/freetype2 (freetype2-2.1.10_1)
        - textproc/expat2 (expat-1.95.8_3)
        - x11-fonts/fontconfig (fontconfig-2.3.2,1)
        - textproc/libxml2 (libxml2-2.6.22)
        - security/nss (nss-3.10)
        - devel/desktop-file-utils (desktop-file-utils-0.10_3)
        - x11/xorg-libraries (xorg-libraries-6.8.2)
        - misc/hicolor-icon-theme (hicolor-icon-theme-0.5)
        - graphics/tiff (tiff-3.7.4)
        - x11-fonts/libXft (libXft-2.1.7)
        - x11-fonts/xorg-fonts-encodings (xorg-fonts-encodings-6.8.2)
        - devel/libIDL (libIDL-0.8.6_1)
        - misc/gnomehier (gnomehier-2.0_7)
        - misc/shared-mime-info (shared-mime-info-0.16_2)
        - x11-fonts/bitstream-vera (bitstream-vera-1.10_2)
        - x11-fonts/xorg-fonts-truetype (xorg-fonts-truetype-6.8.2)
        - x11-toolkits/pango (pango-1.10.1)
        + x11-toolkits/gtk20 (gtk-2.8.7)
        ! www/firefox (firefox-1.0.6_5,1)       (bad C++ code)
--->  Packages processed: 1 done, 27 ignored, 0 skipped and 1 failed
--->  Session ended at: Mon, 28 Nov 2005 17:53:15 -0500 (consumed
01:42:22)

I'm wondering: is this really a bug, or is this indicative of an error I
have made?

Janos Dohanics