echoping appears to compile and run at least on OSF/1, Solaris, Linux, SunOS,
FreeBSD, IRIX and Ultrix. You do not have to be root to install it.

Check the Makefile if you wish (C compiler, libraries to include, there are
  comments to guide you), 
just type "make",
and copy the "echoping" executable anywhere you want. 

Same thing for the man page echoping.1. (You can do an automatic install 
with "make install" but this depends on the "install" program which is 
not portable.)

You can define the following in the Makefile (in CFLAGS):

HTTP 
HyperText Transport Protocol support

TTCP 
T/TCP support if your system supports it (FreeBSD does). See 
   <http://www.noao.edu/~rstevens/ttcp.html>

If 'echoping -h' fails with "tcp_open: unknown service: http/tcp", add
"http" to the services database (typically /etc/services or a NIS map).
Its value is 80. Or, change HTTP_TCP_PORT in inet.h from "http" to "www"
or whatever is defined on your system (at least AIX or Solaris have the 
problem).
