Are there missing files from the tar.gz file of the XML::LibXSLT distribution? Here is the relevant + part of the error message from cpan> install XML::LibXSLT cc -c -I/opt/local/include/libxml2 -I/opt/local/include -fno-common -DPERL_DARWIN -no-cpp-precomp +-fno-strict-aliasing -pipe -I/usr/local/include -I/opt/local/include -Os -DVERSION=\"1.57\" -DXS +_VERSION=\"1.57\" "-I/usr/local/lib/perl5/5.8.7/darwin-2level/CORE" -DHAVE_BLANK -DHAVE_BLANK -D +HAVE_EXSLT LibXSLT.c LibXSLT.xs:6:32: libxslt/xsltconfig.h: No such file or directory LibXSLT.xs:7:26: libxslt/xslt.h: No such file or directory LibXSLT.xs:8:35: libxslt/xsltInternals.h: No such file or directory LibXSLT.xs:9:31: libxslt/transform.h: No such file or directory LibXSLT.xs:10:31: libxslt/xsltutils.h: No such file or directory LibXSLT.xs:11:29: libxslt/imports.h: No such file or directory LibXSLT.xs:12:32: libxslt/extensions.h: No such file or directory LibXSLT.xs:14:28: libexslt/exslt.h: No such file or directory LibXSLT.xs:15:34: libexslt/exsltconfig.h: No such file or directory