gnustep-back-0.28.0 on Fedora 33

[Nerijus Baliunas]

Hello,

I built gnustep-gui-0.28.0 package successfully (F33 already has 
gnustep-base-1.27.0, gnustep-filesystem-2.8.0
and gnustep-make-2.8.0 packages), and when trying to build gnustep-back-0.28.0 
I get an error:

$ rpmbuild -ba gnustep-back.spec 
...
gcc -shared -rdynamic     -Wl,-z,relro -Wl,--as-needed  -Wl,-z,now 
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -shared-libgcc  -pthread 
-fexceptions -o ./libgnustep-back-028.bundle/./libgnustep-back-028 
./obj/libgnustep-back-028.obj/GSBackend.m.o ./gsc/obj/subproject.o 
./x11/obj/subproject.o ./cairo/obj/subproject.o      
-L/home/nerijus/GNUstep/Library/Libraries -L/usr/local/lib64 -L/usr/lib64  
-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now 
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld  -lGL -lcairo -lfreetype  
-lXrender -lcairo -lX11 -lXext  -lXft  -lfontconfig  -lXrandr -lXcursor 
-lXfixes -lXmu -lXt -lXext -lX11     -lgnustep-gui    -lgnustep-base    -lobjc  
 -lm
/tmp/cciL4rej.s: Assembler messages:
/tmp/cciL4rej.s:36609: Error: symbol `_OBJC_METH_VAR_TYPE_47.lto_priv.0' is 
already defined
make[5]: *** [/tmp/ccUXRzFx.mk:5: 
/tmp/libgnustep-back-028.asKbVy.ltrans1.ltrans.o] Error 1

Any ideas what could be a problem?
gcc version is gcc-10.2.1-6.fc33.x86_64.

Regards,
Nerijus