lass="op">&lt;-</span> <span class="cn">FALSE</span></span></span>
<span class="r-in"><span><span class="va">GISRC</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/Sys.getenv.html" class="external-link">Sys.getenv</a></span><span class="op">(</span><span class="st">"GISRC"</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="kw">if</span> <span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/nchar.html" class="external-l