Dear developers, Debian (and Ubuntu) are beginning to remove foo-config legacy scripts. Already, xml2-config has been flagged for removal, with packages being asked to switch to pkg-config.
This patch uses pkg-config's PKG_CHECK_MODULES macro to detect libxml2 or, if pkg-config is not available, falls back to xml2-confg. The patch was created against the master branch of git. I have built PostgreSQL and run `make check`. All 196 tests passed. Hugh
0001-pkg-check-modules-libxml2.patch
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