The GNU/Linux specific support in the net package uses the constant IPV6_TCLASS. This patch to libgo/mksysinfo.sh ensures that the constant is defined even on older GNU/Linux systems. Bootstrapped on x86_64-unknown-linux-gnu. Committed to mainline.
Ian
diff -r 2a1bceb2bd18 libgo/mksysinfo.sh --- a/libgo/mksysinfo.sh Wed Jan 25 17:07:11 2012 -0800 +++ b/libgo/mksysinfo.sh Wed Jan 25 21:41:38 2012 -0800 @@ -192,7 +192,7 @@ sed -e 's/^\(const \)_\(SHUT[^= ]*\)\(.*\)$/\1\2 = _\2/' >> ${OUT} # The net package requires some const definitions. -for m in IPV6_V6ONLY IPPROTO_IPV6 IPV6_JOIN_GROUP IPV6_LEAVE_GROUP; do +for m in IPV6_V6ONLY IPPROTO_IPV6 IPV6_JOIN_GROUP IPV6_LEAVE_GROUP IPV6_TCLASS; do if ! grep "^const $m " ${OUT} >/dev/null 2>&1; then echo "const $m = 0" >> ${OUT} fi