[Q] GNUstep Solaris 64 bit configuration

Hi,

I'm trying to build latest GNUstep (startup-0.15.0) 
on Solaris 2.8 in 64 bit mode.
The following configuration of gnustep-base

CC="gcc -m64 -mcpu=v9"  <CPPFLAGS and LDFLAGS> ./configure

leads to the following problem:

 Linking subproject Additions ...
<path-to-ld>/ld: Relocatable linking with relocations from format
elf64-sparc (shared_obj/GSCategories.o) to format elf32-sparc
(./shared_obj/subproject.o) is not supported
collect2: ld returned 1 exit status
make[1]: *** [shared_obj/subproject.o] Error 1
make: *** [Additions.all.subproject.variables] Error 2

The file ./shared_obj/subproject.o does not exist after that.

How this subproject.o is produced and deleted?
What is the right way to configure?

Thank you,
Tima