$ ./configure ... $ make ... gcc -DHAVE_CONFIG_H -I. -I/home/ssurdock/syslog-ng-1.6.4/src -I. -g -O2 -Wall -I/usr/local/include/libol -D_GNU_SOURCE -c macros.c macros.c: In function `format_tzofs': macros.c:118: error: `tm' undeclared (first use in this function) macros.c:118: error: (Each undeclared identifier is reported only once macros.c:118: error: for each function it appears in.) *** Error code 1 Stop in /home/ssurdock/syslog-ng-1.6.4/src. *** Error code 1 Stop in /home/ssurdock/syslog-ng-1.6.4/src (line 253 of Makefile). *** Error code 1 Stop in /home/ssurdock/syslog-ng-1.6.4/src (line 418 of Makefile). *** Error code 1 Stop in /home/ssurdock/syslog-ng-1.6.4 (line 168 of Makefile). $ Which seems to stem from the GLOBAL_TIMEZONE not being detected and tm not being defined in the "else" part of the #if: format_tzofs(char *dest, size_t left) { size_t length; #if HAVE_GLOBAL_TIMEZONE length = snprintf(dest, left - 1, "%c%02ld%02ld", timezone > 0 ? '-' : '+', (timezone < 0 ? -timezone : timezone) / 3600, (timezone % 3600) / 60); #else length = strftime(dest, left -1, "%z", tm); #endif return length; } And possibly the relevant config.log ... configure:1876: checking for global timezone variable configure:1895: gcc -c -g -O2 conftest.c 1>&5 configure: In function `foo': configure:1889: error: invalid lvalue in assignment configure: failed program was: #line 1881 "configure" ...