Hi Raghav,

belle-sip is not reproducible.

$ guix build --rounds=2 belle-sip
[...]
phase `compress-documentation' succeeded after 0.0 seconds
output ‘/gnu/store/rykd8wp9ibjf3ad4nlg15vmyzgq9izsp-belle-sip-1.6.3’ of ‘/gnu/store/lqdmaxvlhxk25jr7whk5bvi0y1zbzp5a-belle-sip-1.6.3.drv’ differs from ‘/gnu/store/rykd8wp9ibjf3ad4nlg15vmyzgq9izsp-belle-sip-1.6.3-check’ from previous round
build of /gnu/store/lqdmaxvlhxk25jr7whk5bvi0y1zbzp5a-belle-sip-1.6.3.drv failed

$ diffoscope --exclude-directory-metadata /gnu/store/rykd8wp9ibjf3ad4nlg15vmyzgq9izsp-belle-sip-1.6.3 /gnu/store/rykd8wp9ibjf3ad4nlg15vmyzgq9izsp-belle-sip-1.6.3-check
[...]

I'm not saying that this is a blocker for merging, but basically libbellesip.so (and libbellesip.so.0) doesn't always come out the same.  Spooky.