error building skipstone

[David Banning]

I got this error building skipstone. I wonder if anyone knows 
what I can do with it.

...spr -I/usr/X11R6/include/mozilla/uconv -I/usr/X11R6/include/mozilla/webbrowserpersist   -c -o mozilla.o mozilla.cpp
In file included from /usr/X11R6/include/mozilla/string/nsSharableString.h:35,
                 from /usr/X11R6/include/mozilla/string/nsPromiseFlatString.h:28,
                 from /usr/X11R6/include/mozilla/string/nsString2.h:70,
                 from /usr/X11R6/include/mozilla/string/nsString.h:54,
                 from /usr/X11R6/include/mozilla/content/nsIDocument.h:44,
                 from mozilla.cpp:19:
/usr/X11R6/include/mozilla/string/nsBufferHandleUtils.h:36: `#include' expects "FILENAME" or <FILENAME>
In file included from /usr/X11R6/include/mozilla/xpcom/nsCRT.h:45,
                 from /usr/X11R6/include/mozilla/xpcom/nsFileSpec.h:150,
                 from mozilla.cpp:20:
/usr/X11R6/include/mozilla/xpcom/nsCppSharedAllocator.h:6: `#include' expects "FILENAME" or <FILENAME>
gmake[1]: *** [mozilla.o] Error 1
gmake[1]: Leaving directory `/usr/ports/www/skipstone/work/skipstone-0.8.3/src'
gmake: *** [all] Error 2
*** Error code 2

Stop in /usr/ports/www/skipstone.