+<para>
+ Privoxy heavily relies on Philip Hazel's PCRE.
+</para>
+
+<para>
+ The code to filter compressed content makes use of zlib
+ which is written by Jean-loup Gailly and Mark Adler.
+</para>
+
+<para>
+ On systems that lack snprintf(), Privoxy is using a version
+ written by Mark Martinec. On systems that lack strptime(),
+ Privoxy is using the one from the GNU C Library written
+ by Ulrich Drepper.
+</para>