Undefined symbol on Solaris 10 SPARC

Hi!

I'm trying to build GNUstep-base on a Solaris 10 SPARC machine, but at
linking time there is always one undefined symbol:

====
 Compiling file AGSHtml.m ...
 Linking tool autogsdoc ...
Undefined                       first referenced
 symbol                             in file
__objc_msg_forward2                 ../Source/./obj/libgnustep-base.so
ld: fatal: Symbol referencing errors. No output written to obj/
autogsdoc
collect2: ld returned 1 exit status
gmake[2]: *** [obj/autogsdoc] Error 1
gmake[1]: *** [autogsdoc.all.tool.variables] Error 2
====

Is something missing on my box?

Thank you very much in advance,

Hector