diff -uNr postgresql-7.3.1.orig/configure postgresql-7.3.1/configure
--- postgresql-7.3.1.orig/configure	Wed Dec 18 12:37:17 2002
+++ postgresql-7.3.1/configure	Sat Jan 25 16:54:43 2003
@@ -9819,7 +9819,8 @@
 
 
 
-for ac_func in cbrt fcvt getopt_long memmove pstat setproctitle setsid sigprocmask sysconf waitpid dlopen fdatasync
+
+for ac_func in cbrt fcvt getopt_long memmove pstat setproctitle setsid sigprocmask sysconf waitpid dlopen fdatasync getpeereid
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 echo "$as_me:$LINENO: checking for $ac_func" >&5
diff -uNr postgresql-7.3.1.orig/configure.in postgresql-7.3.1/configure.in
--- postgresql-7.3.1.orig/configure.in	Wed Dec 18 12:37:20 2002
+++ postgresql-7.3.1/configure.in	Sat Jan 25 16:54:43 2003
@@ -782,7 +782,7 @@
 # SunOS doesn't handle negative byte comparisons properly with +/- return
 AC_FUNC_MEMCMP
 
-AC_CHECK_FUNCS([cbrt fcvt getopt_long memmove pstat setproctitle setsid sigprocmask sysconf waitpid dlopen fdatasync])
+AC_CHECK_FUNCS([cbrt fcvt getopt_long memmove pstat setproctitle setsid sigprocmask sysconf waitpid dlopen fdatasync getpeereid])
 
 AC_CHECK_DECLS(fdatasync, [], [], [#include <unistd.h>])
 
diff -uNr postgresql-7.3.1.orig/src/backend/libpq/hba.c postgresql-7.3.1/src/backend/libpq/hba.c
--- postgresql-7.3.1.orig/src/backend/libpq/hba.c	Sun Dec 15 05:19:43 2002
+++ postgresql-7.3.1/src/backend/libpq/hba.c	Sat Jan 25 16:54:43 2003
@@ -1311,6 +1311,30 @@
 
 	return true;
 
+#elif defined(HAVE_GETPEEREID)
+	uid_t euid;
+	gid_t egid;
+	struct passwd *pw;
+
+	if (getpeereid(sock, &euid, &egid) != 0)
+	{
+		elog(LOG, "ident_unix: getpeereid() error: %m");
+		return false;
+	}
+
+	pw = getpwuid(euid);
+
+	if (pw == NULL)
+	{
+		elog(LOG, "ident_unix: unknown local user with uid %d",
+			 (int) euid);
+		return false;
+	}
+
+	StrNCpy(ident_user, pw->pw_name, IDENT_USERNAME_MAX + 1);
+
+	return true;
+
 #else
 	elog(LOG, "'ident' auth is not supported on local connections on this platform");
 
diff -uNr postgresql-7.3.1.orig/src/include/pg_config.h.in postgresql-7.3.1/src/include/pg_config.h.in
--- postgresql-7.3.1.orig/src/include/pg_config.h.in	Fri Nov  8 15:53:09 2002
+++ postgresql-7.3.1/src/include/pg_config.h.in	Sat Jan 25 16:59:51 2003
@@ -655,6 +655,9 @@
 /* Define exactly one of these symbols to select shared-mem implementation */
 #undef USE_SYSV_SHARED_MEMORY
 
+/* Define if you have getpeereid() */
+#undef HAVE_GETPEEREID
+
 
 /*
  *------------------------------------------------------------------------