Hi Henrik, We are using MinGW 5.1.4 I tried compiling with ac_cv_func_inet_pton=no but no change in behaviour. I will try to get a previous version of MinGW and try that Cheers Nevil -----Original Message----- From: Henrik Nordstrom [mailto:henrik@xxxxxxxxxxxxxxxxxxx] Sent: Saturday, 15 August 2009 8:30 AM To: Nevil Thatcher Cc: squid-users@xxxxxxxxxxxxxxx Subject: Re: Building squid 3.1.0.13 on MS-Windows (minGW) lör 2009-08-15 klockan 07:45 +1000 skrev Nevil Thatcher: > 2009/08/14 22:45:11| aclIpParseIpData: unknown first address in > '127.0.0.1/32' > FATAL: Bungled squid.conf line 2: acl localhost src 127.0.0.1/32 Sounds like inet_pton is broken in your MinGW install somehow.. or that inet_pton is not what we expect it to be... Which MinGW version are you using? Also try adding ac_cv_func_inet_pton=no to your configure line, forcing it to use the bundled inet_pton version instead of what is provided by MinGW. Regards Henrik