diff -ru netkit-telnet-0.17.orig/telnetd/setproctitle.c netkit-telnet-0.17/telnetd/setproctitle.c
--- netkit-telnet-0.17.orig/telnetd/setproctitle.c	2020-11-22 14:14:35.815624058 +0200
+++ netkit-telnet-0.17/telnetd/setproctitle.c	2020-11-22 14:19:02.956773764 +0200
@@ -86,10 +87,10 @@
 
 	for (i = 0; envp[i] != NULL; i++)
 		continue;
-	__environ = (char **) malloc(sizeof (char *) * (i + 1));
+	environ = (char **) malloc(sizeof (char *) * (i + 1));
 	for (i = 0; envp[i] != NULL; i++)
-		__environ[i] = strdup(envp[i]);
-	__environ[i] = NULL;
+		environ[i] = strdup(envp[i]);
+	environ[i] = NULL;
 
 	/*
 	**  Save start and extent of argv for setproctitle.