pslib should refuse to build with version of libxml2 < 2.6

[jhoblitt]

libxml2 < 2.6 is missing functions that psLib uses. autoconf should check the
version being built against and bail out if a sufficient version isn't found.

[Paul Price]

This has been fixed by someone.

AC_MSG_CHECKING([xml2 version])
XML_VERSION=xml2-config --version
XML_VERSION_major=echo $XML_VERSION | ${PERL} -pe 's|^(\d+).*|\1|'
XML_VERSION_minor=echo $XML_VERSION | ${PERL} -pe 's|^(\d+)\.(\d+).*|\2|'
dnl First test the minimum version of 2.6

if test $XML_VERSION_major -lt 2

( test $XML_VERSION_major -eq 2 && test

$XML_VERSION_minor -lt 6 )
then

AC_MSG_ERROR([requires libxml2 2.6.0 or greater, found $XML_VERSION. Install

newer version or use --with-xml2-config to specify another location.])
else

AC_MSG_RESULT([$XML_VERSION... yes])

fi