I run the following system:
Slackware 7.2 Linux
When trying to compile nedit by running make linux from
the /usr/local/src/nedit-5.1.1 directory, compilation
of preferences.c fails with a complaint about an
undefined stderr. I fixed this by inserting an #include
<stdio.h> near the beginning of the file. It is in
stdio.h where stderr is defined.