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<h2>8.18 C<tt>++</tt> compiler says "NULL redefined"</h2>

<p><em><strong>Q</strong>: When I compile a C<tt>++</tt> program which includes some standard C
header files, the compiler prints error messages about redefinition of
<code>NULL</code><small>...</small>.</em>

<br><p>
<p><strong>A</strong>:  This is because GCC 2.8.1 comes with C<tt>++</tt> header files which
redefine <code>NULL</code> in a way that conflicts with the DJGPP headers. 
It's a bug in the GNU C<tt>++</tt> headers, but until it is fixed, you will
need to make sure you include the C<tt>++</tt> headers <em>after</em> the C
headers.  If that doesn't help in your case, you will need to hack your
headers to reconcile them.

<p>The C header files that come with DJGPP v2.02 work around this problem,
so upgrading to the latest DJGPP release should make these messages go
away.

<p><hr>
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