Lowered autotools version requirements.

configure.ac

 #                                               -*- Autoconf -*-
 
-AC_PREREQ([2.67])
+AC_PREREQ([2.65])
 AC_INIT([knot], [0.2], [bug-me-knot@nic.cz])
 AM_INIT_AUTOMAKE([gnu -Wall -Werror])
 AC_CONFIG_SRCDIR([src/knot/main.c])

src/Makefile.am

@@ -4,6 +4,7 @@ libexec_PROGRAMS = knot-zcompile unittests unittests-zcompile
 sbin_PROGRAMS = knotd
 
 # $(YACC) will generate header file
+AM_CFLAGS = -Wall
 AM_YFLAGS = -d
 libknot_la_YFLAGS = -pcf_ -d
 libknot_la_LFLAGS = # TODO: reentrant parser, prefix