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+= FreeRADIUS Dependencies
+
+Some external dependencies must be installed before building or
+running FreeRADIUS. The core depends on two mandatory libraries:
+`libtalloc` for memory management and `libkqueue` for event
+handling.
+
+Many of the modules also have optional dependencies. For example,
+the LDAP module requires LDAP client libraries to be installed
+and database modules need their respective database client
+libraries.
+
+If building from source code, the configure stage will check for
+the optional dependencies. Any missing libraries will cause that
+particular module to be skipped.
+
+== Libraries
+
+=== libtalloc
+
+Talloc is a memory allocation library available at
+https://talloc.samba.org/talloc/doc/html/index.html
+
+*OSX*
+
+`# brew install talloc`
+
+*Debian, Ubuntu and `dpkg`-based systems*
+
+`# apt-get install libtalloc-dev`
+
+*RedHat or CentOS*
+
+```
+# subscription-manager repos --enable rhel-7-server-optional-rpms
+# yum install libtalloc-dev
+```
+
+=== kqueue
+
+Kqueue is an event / timer API originally written for BSD systems.
+It is _much_ simpler to use than third-party event libraries. A
+library, `libkqueue`, is available for Linux systems.
+
+*OSX*
+
+_kqueue is already available, there is nothing to install._
+
+*Debian, Ubuntu and `dpkg`-based systems*
+
+`# apt-get install libkqueue-dev`
+
+*RedHat or CentOS*
+
+```
+# subscription-manager repos --enable rhel-7-server-optional-rpms
+# yum install libkqueue-dev
+```