"make check" builds already built sources
$ git log -1
commit 2111cb95060feebaeaa3e4bf66da86b38da07fbf (HEAD -> master, origin/master, origin/HEAD)
Author: W. Michael Petullo <mike@flyn.org>
Date: Tue Jun 30 08:01:04 2020 -0500
Fix some autotools warnings
$ make check
...
...
CC libdmapsharing_4_0_la-dmap-av-connection.lo
CC libdmapsharing_4_0_la-dmap-av-record.lo
CC libdmapsharing_4_0_la-dmap-av-share.lo
CC libdmapsharing_4_0_la-dmap-control-connection.lo
...
...
$ make check
...
...
CC libdmapsharing_4_0_la-dmap-av-connection.lo
CC libdmapsharing_4_0_la-dmap-av-record.lo
CC libdmapsharing_4_0_la-dmap-av-share.lo
CC libdmapsharing_4_0_la-dmap-control-connection.lo
...
...