diff -up ypserv-2.26/acinclude.m4.aliases ypserv-2.26/acinclude.m4
--- ypserv-2.26/acinclude.m4.aliases	2012-01-12 15:49:32.325205914 +0100
+++ ypserv-2.26/acinclude.m4	2012-01-12 15:50:07.570203506 +0100
@@ -92,3 +92,18 @@ AC_DEFUN([TYPE_SOCKLEN_T],
     AC_DEFINE([socklen_t], [int], [Define if socklen_t is missing])
   fi
 ])
+
+
+dnl
+dnl Find where aliases file is located
+dnl It can be in /etc/aliases or /etc/mail/aliases
+dnl If file path is specified in argument and file path exists, it is used.
+dnl 
+AC_DEFUN([FIND_ALIASES_PATH], [
+AC_MSG_CHECKING(for aliases file path)
+tmp_aliases="$1"
+test -f /etc/mail/aliases && tmp_aliases="/etc/mail/aliases"
+test -f /etc/aliases && tmp_aliases="/etc/aliases"
+AC_MSG_RESULT($tmp_aliases)
+AC_SUBST(ALIASES, $tmp_aliases)
+])
diff -up ypserv-2.26/configure.in.aliases ypserv-2.26/configure.in
--- ypserv-2.26/configure.in.aliases	2012-01-12 15:48:52.068208666 +0100
+++ ypserv-2.26/configure.in	2012-01-12 15:49:17.842206905 +0100
@@ -149,7 +149,7 @@ fi
 AC_SUBST(MAKE)
 
 dnl Check for aliases path
-AC_PATH_PROG(ALIASES, aliases, /etc/mail/aliases, /etc/mail:/etc)
+FIND_ALIASES_PATH(/etc/aliases)