Errors compiling Libobjc2

[Riccardo Mottola]

Hi

I am trying to buid libobjc2 source on OpenBSD. I am using the system 
compiler clang 7.0.1,
I have installed gnustep-make and configured with ng-gnu-fnu

compilation fails though:

[ 11%] Built target WeakImportClass_optimised
Scanning dependencies of target objc_msgSend
[ 11%] Building C object Test/CMakeFiles/objc_msgSend.dir/objc_msgSend.m.o
[ 11%] Linking C executable objc_msgSend
ld: error: undefined symbol: _Unwind_Resume
>>> referenced by objc_msgSend.m
>>> CMakeFiles/objc_msgSend.dir/objc_msgSend.m.o:(main)
cc: error: linker command failed with exit code 1 (use -v to see invocation)
*** Error 1 in . (Test/CMakeFiles/objc_msgSend.dir/build.make:98 
'Test/objc_msgSend')
*** Error 2 in . (CMakeFiles/Makefile2:6645 
'Test/CMakeFiles/objc_msgSend.dir/all')
*** Error 2 in /home/multix/code/gnustep-svc/libobjc2/Build 
(Makefile:163 'all')
matrix$ clang --version
OpenBSD clang version 7.0.1 (tags/RELEASE_701/final) (based on LLVM 7.0.1)
Target: amd64-unknown-openbsd6.5
Thread model: posix


Ideas?

Riccardo