This patch deactivates the authentication.
It should work but the result of getpeerucred is ENOTSUP (48). 
If you run corosync and pacemaker as root it doesn't matter.
The function is used is to assure that the processess started by pacemaker run as root.
If you run pacemaker as root it doesn't matter.

diff --git pacemaker-Pacemaker-1.1.21/lib/common/ipc.c.~1~ pacemaker-Pacemaker-1.1.21/lib/common/ipc.c
index 3e547f32a..5abb1cfb9 100644
--- pacemaker-Pacemaker-1.1.21/lib/common/ipc.c.~1~
+++ pacemaker-Pacemaker-1.1.21/lib/common/ipc.c
@@ -1447,7 +1447,7 @@ crm_ipc_is_authentic_process(int sock, uid_t refuid, gid_t refgid,
         found_pid = PCMK__SPECIAL_PID;  /* cannot obtain PID (FreeBSD) */
 
 #elif defined(US_AUTH_GETPEERUCRED)
-    ucred_t *ucred;
+    ucred_t *ucred = NULL;
     if (!getpeerucred(sock, &ucred)) {
         errno = 0;
         found_pid = ucred_getpid(ucred);
@@ -1457,7 +1457,8 @@ crm_ipc_is_authentic_process(int sock, uid_t refuid, gid_t refgid,
         if (ret) {
             return (ret < 0) ? ret : -pcmk_err_generic;
         }
-
+		}
+		if (1) {
 #else
 #  error "No way to authenticate a Unix socket peer"
     errno = 0;