Kannel WAP and SMS gateway User Manual page 12

The Gnome XML library (known as gnome-xml and libxml), version 2.2.5 or newer. See
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http://xmlsoft.org/xml.html.
GNU Make.
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Posix threads (pthread.h).
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GNU Bison 1.28 if you modify the WMLScript compiler.
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DocBook markup language tools (jade, jadetex, DocBook stylesheets, etc; see README.docbook), if
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you want to format the documentation (pre-formatted versions are available).
Hardware requirements are fluffier. We haven't benchmarked Kannel yet, so there are no hard numbers,
but a reasonably fast PC workstation (400 MHz Pentium II, 128 MB RAM) should serve several
concurrent users or tens of SMS messages per second without problems.
Chapter 1. Introduction
5