Build fails on 10.6: `Unknown option or message digest: dss1`

[barracuda156]

:info:build     /bin/sh -c /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_aqua_Smultron/Smultron/work/Fraise-312c9f335438fd80656650573d62c260322727b3/build/Fraise.build/Release/Distribution.build/Script-1F7486CA114F1F9900767B18.sh
:info:build dgst: Unknown option or message digest: dss1
:info:build dgst: Use -help for summary.
:info:build 008AE408:error:0308010C:digital envelope routines:inner_evp_generic_fetch:unsupported:crypto/evp/evp_fetch.c:355:Global default library context, Algorithm (dss1 : 0), Properties (<null>)
:info:build Unable to load signing private key with name 'Sparkle Private Key' from keychain
:info:build Could not create file parser context for file "-": No such file or directory at -e line 1.
:info:build ** BUILD FAILED **