Invalid compiler error

[Tron Thomas <tron dot thomas at verizon dot net>]

I wrote a simple program to test an open source library I am planning to 
use in a development project.  I want the project to be supported on 
different compilers, including the GCC compiler included with Cygwin.  I 
have been able to successfully build my test application using the 
Micrsoft and Borland compilers.  When I try to build the program with 
the Cygwin compiler, I get a compiler error related to a header file I'm 
including from the library.

Here is the error message I get:

#if with no expression

This is the line of code that is apparently causing the problem:

#elif _WIN32

I don't see why this should be causing a problem especially when the 
other compilers build without any problems.  I use -DWIN32 in the 
command line arguments I used when I build the application.

Has anyone seen the type of problem before (I search the mailing 
archives and didn't find anything)?
Can anyone offer any suggestions about how to resolve this issue?



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