When compiling althttpd.c on FreeBSD, there's a missing header. Since you can't submit tickets on <a href="https://www.sqlite.org/docsrc/finfo?name=misc/althttpd.c">sqlite.org/misc/althttpd.c</a>, I'm including it here since it's used primarily for fossil.

<pre>--- althttpd.c.orig	2013-01-08 20:51:11.000000000 +0000
+++ althttpd.c	2013-01-08 20:51:05.000000000 +0000
@@ -86,6 +86,9 @@
 #include <sys/sendfile.h>
 #endif
 #include <assert.h>
+#ifdef __FreeBSD__
+# include <signal.h>
+#endif
 
 /*
 ** Configure the server by setting the following macros and recompiling.</pre>