diff -ubr mpack-1.6-orig/unixos.c mpack-1.6/unixos.c
--- mpack-1.6-orig/unixos.c	2013-08-17 14:32:38.102772775 +0200
+++ mpack-1.6/unixos.c	2013-08-17 14:32:43.180792505 +0200
@@ -38,10 +38,6 @@
 #define MAXHOSTNAMELEN 64
 #endif
 
-extern int errno;
-extern char *malloc();
-extern char *getenv();
-
 int overwrite_files = 0;
 int didchat;
 
Only in mpack-1.6: unixos.o
Only in mpack-1.6: unixunpk.o
Only in mpack-1.6: uudecode.o
diff -ubr mpack-1.6-orig/xmalloc.c mpack-1.6/xmalloc.c
--- mpack-1.6-orig/xmalloc.c	2013-08-17 14:32:38.102772775 +0200
+++ mpack-1.6/xmalloc.c	2013-08-17 14:33:08.900892319 +0200
@@ -24,7 +24,6 @@
  */
 #include <stdio.h>
 #include <string.h>
-extern char *malloc(), *realloc();
 
 char *xmalloc (int size)
 {
Only in mpack-1.6: xmalloc.o