+@c ==================================================================
+@node GMP, OpenSSL, Libraries, Libraries
+@subsection GMP
+
+@cindex GMP
+tinc uses the GNU Multiple Precision (GMP) library to do some
+authentication-related calculations. tinc cannot run without this
+library. If you try to configure the tinc source code without this
+library installed, you will get an error message.
+
+Currently, versions 1.x, 2.x, 3.0 and 3.0.1 of this library are
+supported. You may try to configure if you have another version
+installed, chances are big it works without a problem.
+
+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 can't install GMP this way, you can get the source of this latest
+version of this library from
+@url{http://www.gnu.org/software/gmp/gmp.html}. 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 OpenSSL, , GMP, Libraries
+@subsection OpenSSL
+
+@cindex OpenSSL
+For all cryptography-related functions, tinc uses the functions provided
+by the OpenSSL library. We recommend using version 0.9.5 or 0.9.6 of
+this library. Other versions may also work, but we can guarantee
+nothing.
+
+Disclaimers from the subsection on GMP also apply here; if this library
+is not installed, you wil get an error when running configure. Support
+for running tinc without having OpenSSL installed @emph{may} be added in
+the future.
+
+If you have to install OpenSSL manually, you can get the source code
+from @url{http://www.openssl.org/}. 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
+@c
+@c
+@c Installing tinc
+@c
+@c
+@c
+@c