ariables are also required
by <a href="http://srfi.schemers.org/srfi-96/srfi-96.html" title="SRFI
96: SLIB Prerequisites">SRFI 96: SLIB Prerequisites</a>.
Providing a means to access environment variables is therefore
indispensable for writing practical programs in Scheme.
</p>
<p>Most widely-used Scheme implementations provide a function for
getting the value of a specified environment variable.  The name for
this function is usually getenv, but varies (<a href="#0.1_appendix">see
below</a>).  Some impleme