I downloaded the tarballs from ftp.iastate.edu that were datestamped 1/4/95

I had to make two quick patches to two files in src/lib/libc/rpc:

--- svc.c~      Wed Jan  4 06:11:58 1995
+++ svc.c       Tue Jan 10 14:03:42 1995
@@ -71,6 +71,8 @@

 static struct svc_callout *svc_find();

+extern int svc_maxfd;          /* XXX added by ken to make compile */
+
 /* ***************  SVCXPRT related stuff **************** */

 /*

and

--- svc_run.c~  Wed Jan  4 06:11:58 1995
+++ svc_run.c   Tue Jan 10 14:04:14 1995
@@ -40,6 +40,8 @@
 #include <rpc/rpc.h>
 #include <sys/errno.h>

+extern int svc_maxfd;          /* XXX added by ken to make compile */
+
 void
 svc_run()
 {

before these adjustments the files would not compile.