Phil Shirts on 20191008 added idlRpcClient.  I also include libidl_rpc.so, to be similar to the sunos brach of the binaries.  I don't know if it is needed.  I saved them both as freeland so I wouldn't have to change the directories permissions or ownership.  

These commands compiled with the above Makefile:

in /home/shirts/sdowww1_rpc_files
make clean
make all
cc -o idlRpcClient -L. -Wl,-rpath,. rpc_tout.o rpc_clnt.o idl_rpc_xdr.o idl_rpc_test.o idl_rpc_obsolete.o -lidl_rpc

On sdowww1, the list of file in /home/shirts/sdowww1_rpc_files is:
-rw-r--r-- 1 shirts users    5156 Oct  8 13:05 Makefile
-rw-r--r-- 1 shirts users    5138 Oct  8 13:03 Makefile_orig
-rw-r--r-- 1 shirts users    1999 Feb  7  2019 README.TXT
-rwxr-xr-x 1 shirts users    8824 Oct  8 13:42 example
-rw-r--r-- 1 shirts users     921 Feb  7  2019 example.c
-rw-r--r-- 1 shirts users    2352 Oct  8 13:42 example.o
-rwxr-xr-x 1 shirts users   50672 Oct  8 13:50 idlRpcClient
-rw-r--r-- 1 shirts users    2689 Jun 25  2003 idlRpcClient.c
-rw-r--r-- 1 shirts users  118561 Feb  7  2019 idl_export.h
-rw-r--r-- 1 shirts users     353 Feb  7  2019 idl_rpc.export
-rw-r--r-- 1 shirts users    4316 Feb  7  2019 idl_rpc.h
-rw-r--r-- 1 shirts users   13058 Feb  7  2019 idl_rpc_obsolete.c
-rw-r--r-- 1 shirts users    4095 Feb  7  2019 idl_rpc_obsolete.h
-rw-r--r-- 1 shirts users    8800 Oct  8 13:42 idl_rpc_obsolete.o
-rwxr-xr-x 1 shirts users   31184 Oct  8 13:42 idl_rpc_test
-rw-r--r-- 1 shirts users   35616 Feb  7  2019 idl_rpc_test.c
-rw-r--r-- 1 shirts users   39552 Oct  8 13:42 idl_rpc_test.o
-rwxr-xr-x 1 shirts users   31208 Oct  8 13:42 idl_rpc_test_loopback
-rw-r--r-- 1 shirts users   35553 Feb  7  2019 idl_rpc_test_loopback.c
-rw-r--r-- 1 shirts users   39568 Oct  8 13:42 idl_rpc_test_loopback.o
-rw-r--r-- 1 shirts users   11183 Feb  7  2019 idl_rpc_xdr.c
-rw-r--r-- 1 shirts users    1531 Feb  7  2019 idl_rpc_xdr.h
-rw-r--r-- 1 shirts users    7112 Oct  8 13:42 idl_rpc_xdr.o
-rwxr-xr-x 1 shirts users   24448 Oct  8 13:42 idlrpc
lrwxrwxrwx 1 shirts users      14 Oct  8 13:20 libXp.so.6 -> libXp.so.6.2.0
-rwxr-xr-x 1 shirts users   38792 Feb  7  2019 libXp.so.6.2.0
-rwxr-xr-x 1 shirts users 1252404 Feb  7  2019 libcll.so
-rwxr-xr-x 1 shirts users   21168 Oct  8 13:42 libidl_rpc.so
-rw-r--r-- 1 shirts users   37437 Feb  7  2019 rpc_clnt.c
-rw-r--r-- 1 shirts users   15800 Oct  8 13:42 rpc_clnt.o
-rw-r--r-- 1 shirts users     768 Apr 28  1997 rpc_link.txt
-rw-r--r-- 1 shirts users   14437 Feb  7  2019 rpc_srvr.c
-rw-r--r-- 1 shirts users   10928 Oct  8 13:42 rpc_srvr.o
-rw-r--r-- 1 shirts users    4712 Feb  7  2019 rpc_tout.c
-rw-r--r-- 1 shirts users    3856 Oct  8 13:42 rpc_tout.o

Some of these files were pulled from:
/usr/local/harris/idl87

(There is probably a better way to compile this by supplying paths in the Makefile.  But, that is what I did.) --PGS