"James Wetterau" says:
..> 
> The error output in both cases includes these lines in config.log:
> 
> gcc: couldn't run
> `/usr/bin/i386--netbsdelf-gcc--I/usr/pkgsrc/textproc/libxml2/w
> ork/.buildlink/include': No such file or directory

Sorry -- to make that clearer, in each case it refers to the pertinent
package-name/work/.buildlink/include -- not "libxml2" in both cases.