+@c ==================================================================
+@node zlib, lzo, OpenSSL, Libraries
+@subsection zlib
+
+@cindex zlib
+For the optional compression of UDP packets, tinc uses the functions provided
+by the zlib library.
+
+If this library is not installed, you wil get an error when configuring
+tinc for build. Support for running tinc without having zlib
+installed @emph{may} be added in the future.
+
+You can use your operating system's package manager to install this if
+available. Make sure you install the development AND runtime versions
+of this package.
+
+If you have to install zlib manually, you can get the source code
+from @url{http://www.gzip.org/zlib/}. Instructions on how to configure,
+build and install this package are included within the package. Please
+make sure you build development and runtime libraries (which is the
+default).
+
+
+@c ==================================================================
+@node lzo, , zlib, Libraries
+@subsection lzo
+
+@cindex lzo
+Another form of compression is offered using the lzo library.
+
+If this library is not installed, you wil get an error when configuring
+tinc for build. Support for running tinc without having lzo
+installed @emph{may} be added in the future.
+
+You can use your operating system's package manager to install this if
+available. Make sure you install the development AND runtime versions
+of this package.
+
+If you have to install lzo manually, you can get the source code
+from @url{http://www.oberhumer.com/opensource/lzo/}. Instructions on how to configure,
+build and install this package are included within the package. Please
+make sure you build development and runtime libraries (which is the
+default).
+
+