Description of problem:
"file" reports some c++ source files as 
Lisp/Scheme program text

Version-Release number of selected component (if applicable):
file-5.03-2.fc11.x86_64
and
file-5.03-2.fc11.i586

How reproducible:
Always, on certain files.

So far, I haven't found a pattern which are affected, but I am observing this bug on many files.

Steps to Reproduce:
1. file <*>.cpp
  
Actual results:
# file SbClip.cpp 
SbClip.cpp: Lisp/Scheme program text

Expected results:
Correct results, "ASCII English text", "ASCI C program text" or similar


Additional info:
This breaks applying "file" to check source files' encodings to conditionally convert them from ISO* to utf-8, e.g. when building rpms.

This affects building rpms as part of Fedora and is causing mis-built packages.