Markus, First, please correct me if I'm wrong but I looked for 'gssapi.h' in config.log and I'm assuming that config.log contains all the log information from doing a /configure? Assuming that I am correct, I couldn't find 'gssapi' anywhere inside the log file so I'm not sure if that's a good thing or a bad thing. I went ahead and dumped the output of the ./configure to a file and these are the only lines that I could find for gssapi.h: checking gssapi.h usability... no checking gssapi.h presence... no checking for gssapi.h... no checking gssapi/gssapi.h usability... no checking gssapi/gssapi.h presence... no checking for gssapi/gssapi.h... no If there's anything else that I could try, I'd greatly appreciate it. Thanks! -----Original Message----- From: news [mailto:news@xxxxxxxxxxxxx] On Behalf Of Markus Moeller Sent: Tuesday, August 11, 2009 3:25 PM To: squid-users@xxxxxxxxxxxxxxx Subject: Re: Kerberos Authentication - Squid 3.1.0.13 Hi Daniel, Did you see any configure errors for gssapi.h ? Markus "Daniel" <Squid@xxxxxxxxxxxxx> wrote in message 001301ca19fe$9f450a50$ddcf1ef0$@com">news:001301ca19fe$9f450a50$ddcf1ef0$@com... Good afternoon, In my attempt to get Squid on our SLES 11 box authenticating with Kerberos (negotiate), I used the following to re-configure: ./configure --prefix=/usr/local/squid --enable-cachemgr-hostname=sclthdq01w --enable-auth="negotiate" --enable-negotiate-auth-helpers="squid_kerb_auth" The "configure" appears to run without any issues. However, upon running "make all" I receive the following errors: squid_kerb_auth.c:507: error: implicit declaration of function âgss_display_nameâ make[5]: *** [squid_kerb_auth.o] Error 1 make[5]: Leaving directory `/tmp/squid-3.1.0.13/helpers/negotiate_auth/squid_kerb_auth' make[4]: *** [all-recursive] Error 1 make[4]: Leaving directory `/tmp/squid-3.1.0.13/helpers/negotiate_auth/squid_kerb_auth' make[3]: *** [all] Error 2 make[3]: Leaving directory `/tmp/squid-3.1.0.13/helpers/negotiate_auth/squid_kerb_auth' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/tmp/squid-3.1.0.13/helpers/negotiate_auth' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/tmp/squid-3.1.0.13/helpers' make: *** [all-recursive] Error 1 Any ideas?? As always, T.I.A. -Daniel