...
--- ../toxav/libtoxav_la-toxav.lo ---
  CC       ../toxav/libtoxav_la-toxav.lo
In file included from ../toxav/toxav.c:27:
../toxav/rtp.h:78:14: warning: redefinition of typedef '__fail_if_misaligned' is a C11 feature [-Wtypedef-redefinition]
typedef char __fail_if_misaligned [ sizeof(struct RTPMessage) == 82 ? 1 : -1 ];
             ^
../toxav/rtp.h:68:14: note: previous definition is here
typedef char __fail_if_misaligned [ sizeof(struct RTPHeader) == 80 ? 1 : -1 ];
             ^
--- ../toxav/libtoxav_la-toxav_old.lo ---
  CC       ../toxav/libtoxav_la-toxav_old.lo
In file included from ../toxav/toxav_old.c:26:
In file included from ../toxav/group.h:24:
In file included from ../toxav/../toxcore/group.h:28:
In file included from ../toxcore/Messenger.h:29:
In file included from ../toxcore/friend_requests.h:27:
In file included from ../toxcore/friend_connection.h:28:
In file included from ../toxcore/net_crypto.h:27:
In file included from ../toxcore/DHT.h:27:
../toxcore/crypto_core.h:30:10: fatal error: 'sodium.h' file not found
#include <sodium.h>
         ^
1 error generated.
*** [../toxav/libtoxav_la-toxav_old.lo] Error code 1



Fix: install security/libsodium