Headless support

[visiblethinking]

It looks like it's looking for video and audio libraries and seg faulting out. 15:32:44.062 pjsua_timer .Mutex created 15:32:44.062 pjsua_core.c .PJSUA state changed: NULL --> CREATED [Thu Aug 1 15:32:44 2019] 15:32:44.062 sip_endpoint.c .Module "mod-pjsua-log" registered [Thu Aug 1 15:32:44 2019] 15:32:44.062 sip_endpoint.c .Module "mod-tsx-layer" registered [Thu Aug 1 15:32:44 2019] 15:32:44.062 sip_endpoint.c .Module "mod-stateful-util" registered [Thu Aug 1 15:32:44 2019] 15:32:44.063 sip_endpoint.c .Module "mod-ua" registered [Thu Aug 1 15:32:44 2019] 15:32:44.063 sip_endpoint.c .Module "mod-100rel" registered [Thu Aug 1 15:32:44 2019] 15:32:44.063 sip_endpoint.c .Module "mod-pjsua" registered [Thu Aug 1 15:32:44 2019] 15:32:44.063 sip_endpoint.c .Module "mod-invite" registered [Thu Aug 1 15:32:44 2019] 15:32:44.066 alsa_dev.c ..ALSA driver found 0 devices [Thu Aug 1 15:32:44 2019] 15:32:44.066 alsa_dev.c ..ALSA initialized [Thu Aug 1 15:32:44 2019] 15:32:44.066 pjlib ..select() I/O Queue created (0x55e324a19478) [Thu Aug 1 15:32:44 2019] 15:32:44.068 pjsua_vid.c ..Initializing video subsystem.. [Thu Aug 1 15:32:44 2019] 15:32:44.072 v4l2_dev.c ...Video4Linux2 has 0 devices Segmentation fault (core dumped)