  So the first
FFI example is built (this is in Linux):
</p>

<pre class="indented">
gcc -c s7.c -I.
gcc -o ex1 ex1.c s7.o -lm -I. -ldl -Wl,-export-dynamic
ex1
&gt; (load "cload.scm")
<em class="gray">c-define-1</em>
&gt; (c-define '(double j0 (double)) "m" "math.h")
<em class="gray">#t</em>
&gt; (m:j0 0.5)
<em class="gray">0.93846980724081</em>
</pre>

<p>See also r7rs.scm, libc.scm, libgsl.scm, libm.scm, libdl.scm, and libgdbm.scm.
libutf8proc.scm exists, but I have not tested it at all.
</p>

<p>The defa