 and C++ compilers used during the build. By default,
<code>gcc</code> and <code>g++</code> are used and the debug/optimisation
level is left unchanged.</p>
</dd>

<dt><code>LDFLAGS</code></dt>
<dd><p>An environment variable specifying flags to
pass when linking programs. These should be empty and
<code>PKG_CONFIG_PATH</code> is recommended to be used instead. If needed
it can be used to direct the linker to use libraries in nonstandard
directories. For example, <code>LDFLAGS="-L/usr/X11R6/lib"</code>.</p>
