'make install' reports:

Making install in doc
Making install in devhelp
make[3]: Nothing to be done for `install-exec-am'.
/bin/sh ../../mkinstalldirs /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/gtk-doc/html/libxml2
mkdir -p -- /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/gtk-doc/html/libxml2
/usr/bin/install -c -m 0644 libxml2.devhelp /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/gtk-doc/html/libxml2
/usr/bin/install -c -m 0644 home.png left.png right.png up.png style.css /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/gtk-doc/html/libxml2
/usr/bin/install -c -m 0644 index.html general.html libxml2-c14n.html libxml2-catalog.html libxml2-chvalid.html libxml2-debugXML.html libxml2-dict.html libxml2-DOCBparser.html libxml2-encoding.html libxml2-entities.html libxml2-globals.html libxml2-hash.html libxml2-HTMLparser.html libxml2-HTMLtree.html libxml2-list.html libxml2-nanoftp.html libxml2-nanohttp.html libxml2-parser.html libxml2-parserInternals.html libxml2-pattern.html libxml2-relaxng.html libxml2-SAX2.html libxml2-SAX.html libxml2-schemasInternals.html libxml2-schematron.html libxml2-threads.html libxml2-tree.html libxml2-uri.html libxml2-valid.html libxml2-xinclude.html libxml2-xlink.html libxml2-xmlautomata.html libxml2-xmlerror.html libxml2-xmlexports.html libxml2-xmlIO.html libxml2-xmlmemory.html libxml2-xmlmodule.html libxml2-xmlreader.html libxml2-xmlregexp.html libxml2-xmlsave.html libxml2-xmlschemas.html libxml2-xmlschemastypes.html libxml2-xmlstring.html libxml2-xmlunicode.html libxml2-xmlversion.html libxml2-xmlwriter.html libxml2-xpath.html libxml2-xpathInternals.html libxml2-xpointer.html /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/gtk-doc/html/libxml2
Making install in examples
make[3]: Nothing to be done for `install-exec-am'.
/bin/sh ../../mkinstalldirs /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/doc/libxml2
/usr/bin/install -c -m 0644 ./*.html ./*.c ./*.xml ./*.xsl ./*.res /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/doc/libxml2
install: ./*.html: No such file or directory
make[3]: [install-data-local] Error 71 (ignored)
make[3]: Nothing to be done for `install-exec-am'.
/bin/sh ../mkinstalldirs /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/doc/libxml2
/usr/bin/install -c -m 0644 ./xml.html ./encoding.html ./FAQ.html ./structure.gif ./DOM.gif ./smallfootonly.gif ./redhat.gif ./libxml.gif ./w3c.png ./Libxml2-Logo-180x168.gif ./Libxml2-Logo-90x34.gif /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/doc/libxml2
/bin/sh ../mkinstalldirs /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/doc/libxml2/html
mkdir -p -- /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/doc/libxml2/html
/usr/bin/install -c -m 0644 ./html/*.html /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/doc/libxml2/html
/usr/bin/install -c -m 0644 ./html/*.png /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/doc/libxml2/html
/usr/bin/install -c -m 0644 ./html/index.sgml /Volumes/SandBox/fink/sw/src/fink.build/root-libxml2-2.6.22-1/Volumes/SandBox/fink/sw/share/doc/libxml2/html
install: ./html/index.sgml: No such file or directory
make[3]: [install-data-local] Error 71 (ignored)

The installation completes because those errors are ignored, but why are they occurring at all? Sure enough, there is no index.sgml or *.html in the doc/html directrory. I didn't see any messages during ./configure about missing build tools nor any warnings during the build about any files being not built for any reason.

I see the same results whether or not I have libxslt already installed in the target prefix.