How would I pursue this error? Look at the XML::XPathEngine distribution and start looking for the error message somewhere around where it does Writing MYMETA.yml and MYMETA.json?

Hi,

Yes, finding the responsible file is what is required,

Might use something like Devel::Trace to narrow down the file responsible ... but it looks like MIROD/XML-XPathEngine-0.14/Makefile.PL is the file , this part

# add the license bit in META.yaml
unless( `$^X -n -e'print if( m{license\\s*:\\s*perl})' Makefile`)
  { system $^X . q{ -p -i -e's{^((.*)distribution_type: module(.*))}{$
+1\n$2license: perl$3}m' Makefile}; }
[download]

Thats not likely to work on windows , but it probably doesn't have to ... I vaguely recall some linux distribution requiring perl distributions to include license before they would use it with their 5.8.x version of perl

However WriteMakefile could use a LICENSE option which is available since 6.31 (perl v5.10.0 and up)