re: cvs compile error on macOS 10.15.2 Catalina

I just ran into the same problem and I found what seems to be a fix.

The issue comes because stdio.h declares its own getline function, and =
that function has a slightly different signature than what cvs declares =
it as. Also, since libc already defines getline, when we get to the cvs =
definition for getline, we get an error, because there are two =
definitions for the same function. I got past this by simply commenting =
out the getline declaration in cvs-1.11.23/lib/getline.h and the getline =
definition in cvs-1.11.23/lib/getline.c.

After this modification, cvs seems to compile and run fine.=