2 Incorporated code

Three pieces of external code are included in the Exim distribution.

• Regular expressions are supported in the main Exim program and in the Exim monitor using the freely-distributable PCRE library, copyright (c) 1998 University of Cambridge. The source is distributed in the directory `src/pcre'.
• RFC 1413 callbacks are supported in the main Exim program using the `libident' library made freely available by Peter Eriksson at `ftp.lysator.liu.se'. Some modifications have been made in order to support IPv6. The source is distributed in the directory called `src/libident'.
• The Exim Monitor program, which is an X-Window application, includes modified versions of the Athena StripChart and TextPop widgets. This code is copyright by DEC and MIT, and their permission notice appears below, in accordance with the conditions expressed therein.

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