Seems AF_INET6 is used unconditionally in src/cfg-grammar.y: source_afsocket : KW_UNIX_DGRAM '(' source_afunix_dgram_params ')' { $$ = $3; } | KW_UNIX_STREAM '(' source_afunix_stream_params ')' { $$ = $3; } | KW_UDP { last_addr_family = AF_INET; } '(' source_afinet_udp_params ') ' { $$ = $4; } | KW_TCP { last_addr_family = AF_INET; } '(' source_afinet_tcp_params ') ' { $$ = $4; } | KW_UDP6 { last_addr_family = AF_INET6; } '(' source_afinet_udp_params ')' { $$ = $4; } | KW_TCP6 { last_addr_family = AF_INET6; } '(' source_afinet_tcp_params ')' { $$ = $4; } ; A build on solaris 2.6/7 fails with: cc -DHAVE_CONFIG_H -I. -I. -I.. -DPATH_SYSCONFDIR=\"/etc/opt/TWWfsw/syslogng1911\" -DPATH_LOCALSTATEDIR=\"/var/opt/TWWfsw/syslogng1911\" -I/opt/TWWfsw/libglib26/include -I/opt/TWWfsw/libglib26/lib/include -I/opt/TWWfsw/gettext014/include -I/opt/TWWfsw/syslogng1911/include/eventlog -D_GNU_SOURCE -mr -Qn -xstrconst -xO2 -xtarget=ultra2 -xarch=v8plusa -c cfg-grammar.c "/home/bazsi/zwa/work/syslog-ng-2.0/syslog-ng/src/cfg-grammar.y", line 303: undefined symbol: AF_INET6 "/home/bazsi/zwa/work/syslog-ng-2.0/syslog-ng/src/cfg-grammar.y", line 304: undefined symbol: AF_INET6 "/home/bazsi/zwa/work/syslog-ng-2.0/syslog-ng/src/cfg-grammar.y", line 539: undefined symbol: AF_INET6 "/home/bazsi/zwa/work/syslog-ng-2.0/syslog-ng/src/cfg-grammar.y", line 540: undefined symbol: AF_INET6 cc: acomp failed for cfg-grammar.c -- albert chin (china@thewrittenword.com)