git commit a9910d89, merged last Friday, broke the build on Debian oldstable, which doesn't have event2 headers. ``` CC src/or/dns.o src/or/dns.c: In function ‘configure_nameservers’: src/or/dns.c:1496: error: ‘DNS_OPTION_HOSTSFILE’ undeclared (first use in this function) src/or/dns.c:1496: error: (Each undeclared identifier is reported only once src/or/dns.c:1496: error: for each function it appears in.) cc1: warnings being treated as errors src/or/dns.c:1498: error: implicit declaration of function ‘evdns_base_load_hosts’ src/or/dns.c:1498: error: nested extern declaration of ‘evdns_base_load_hosts’ make[1]: *** [src/or/dns.o] Error 1 make[1]: Leaving directory `/var/home/bwauth/work/tor' make: *** [all] Error 2 ```