the krb4 stuff needs -lcom_err to link now, for some odd reason. This is

possibly only on some platforms, but it happens on my Solaris 2.7 box and I
don't know anyone else that regularly build curl with krb4 support.

configure.ac

@@ -560,7 +560,7 @@ then
       AC_CHECK_HEADERS(krb.h)
 
       dnl we found the required libraries, add to LIBS
-      LIBS="-lkrb -ldes $LIBS"
+      LIBS="-lkrb -lcom_err -ldes $LIBS"
 
       dnl Check for function krb_get_our_ip_for_realm
       dnl this is needed for NAT networks