Problems creating Patch 2.0.12u3

[Steve Ginn]

I was recently trying to compile the above named app and everything
ran fine until it started linking and came up with the following
problems:

Version.c
	cc patch.o pch.o inp.o util.o version.o -o patch

/bin/ld : error: Unresolved externals:

_rindex in file(s):
patch.o (patch.c)
*** Error code 2

Stop.


If anyone has any ideas, I would appreciate the help!

Thanks in advance!
Steve Ginn