--- src/packlib/cspack/sysreq/serror.c	2020-12-11 16:28:41.645794059 +0100
+++ src/packlib/cspack/sysreq/serror.c	2020-12-11 16:41:16.984757413 +0100
@@ -176,8 +176,9 @@
         }
         else {
 #if !defined(vms)
-                if ((n>0) && (n<sys_nerr)) {
-                        return((char*)sys_errlist[n]);
+                char * c = strerror(n);
+                if (c) {
+                        return c;
                 }
                 else {
                         (void) sprintf(buf,"%s: %d\n",
--- src/packlib/cspack/sysreq/socket.c	2020-12-11 16:28:41.645794059 +0100
+++ src/packlib/cspack/sysreq/socket.c	2020-12-11 16:42:33.905753681 +0100
@@ -415,7 +415,7 @@
 s_errmsg()                              /* return last error message    */
 {
 #if !defined(vms)
-        return((char*)sys_errlist[errno]);
+        return((char*)strerror(errno));
 #else /* vms */
 #if defined(MULTINET) && (MULTINET == 1)
         return(vms_errno_string());