couchdb has broken dependencies in the F-21 tree:
On x86_64:
couchdb-1.6.0-9.fc21.x86_64 requires erlang(erl_nif_version) = 0:2.4
couchdb-1.6.0-9.fc21.x86_64 requires erlang(erl_drv_version) = 0:2.2
On i386:
couchdb-1.6.0-9.fc21.i686 requires erlang(erl_nif_version) = 0:2.4
couchdb-1.6.0-9.fc21.i686 requires erlang(erl_drv_version) = 0:2.2
On armhfp:
couchdb-1.6.0-9.fc21.armv7hl requires erlang(erl_nif_version) = 0:2.4
couchdb-1.6.0-9.fc21.armv7hl requires erlang(erl_drv_version) = 0:2.2
Please resolve this as soon as possible.