(solved) I checked pkgsrc/net/nsd/Makefile again and `CPPFLAGS="-D_OPENBSD_SOURCE"` did the trick
.if ${OPSYS} == "NetBSD"
# For reallocarray(3)
CPPFLAGS+= -D_OPENBSD_SOURCE
.endif
(solved) I checked pkgsrc/net/nsd/Makefile again and `CPPFLAGS="-D_OPENBSD_SOURCE"` did the trick
.if ${OPSYS} == "NetBSD"
# For reallocarray(3)
CPPFLAGS+= -D_OPENBSD_SOURCE
.endif