~/irssi-0.8.10$ ./configure --prefix=/usr --sysconfdir=/etc
   <snip>
checking size of long long... 8
checking size of off_t... 8
checking whether GLib is unpacked to irssi dir... no
./configure: line 7168: syntax error near unexpected token `1.2.0,,,'
./configure: line 7168: `      AM_PATH_GLIB(1.2.0,,, $glib_modules)'