For the record: prompted by a question Jan asked, I removed the
OS-packaged libjansson-dev and installed from source [1]. Bingo!
info: [k20.aa] DNSSEC, executing event 'generate initial keys'
info: [k20.aa] DNSSEC, loaded key, tag 534, algorithm 10, KSK yes, ZSK no, public yes,
active yes
info: [k20.aa] DNSSEC, loaded key, tag 35202, algorithm 10, KSK no, ZSK yes, public yes,
active yes
info: [k20.aa] DNSSEC, signing started
info: [k20.aa] DNSSEC, successfully signed
info: [k20.aa] DNSSEC, next signing on 2015-02-18T09:58:55
info: [k20.aa] loaded, serial 0 -> 3
Regards,
-JP
[1]
http://www.digip.org/jansson/