# unbound.h only added these constants on 29 Nov 2021:
UB_NOERROR     0
UB_SOCKET     -1
UB_NOMEM      -2
UB_SYNTAX     -3
UB_SERVFAIL   -4
UB_FORKFAIL   -5
UB_AFTERFINAL -6
UB_INITFAIL   -7
UB_PIPE       -8
UB_READFILE   -9
UB_NOID      -10
