I wrote:
> That code wouldn't be getting compiled if configure hadn't found
> getpeerucred present, so I'll bet the problem is just lack of the
> #include file that declares the above symbols. A bit of grepping
> of /usr/include should give you the answer.
... but looking in src/backend/libpq/auth.c suggests that fe-connect
is lacking
#if defined(HAVE_STRUCT_CMSGCRED) || defined(HAVE_STRUCT_FCRED) || defined(HAVE_STRUCT_SOCKCRED)
#include <sys/uio.h>
#include <sys/ucred.h>
#endif
#ifdef HAVE_UCRED_H
#include <ucred.h>
#endif
regards, tom lane