You need to install libxml. Read the doc for XML package for more information.
>From: "Susan J. Miller" <sjmiller at u.arizona.edu>
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>Subject: [R] installing the XML package
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>X-Original-Date: Thu, 16 Jan 2003 14:03:16 -0700
>Date: Thu, 16 Jan 2003 14:03:16 -0700
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>I'm trying to install the XML package in R 1.6.1
>(>install.packages("XML")). The download is OK, but during
>configuration the file parser.h cannot be found (it looks in libxml/ and
>gnome-xml/ then gives up). What is missing from my system?
>
>--
>Thanks,
>-susan
>
>Susan J. Miller
>Biotechnology Computing Facility
>Arizona Research Laboratories
>Bio West 228
>University of Arizona
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