This might have been fixed for a release, but building from git:
$ git clone github.com:jandrew/Spreadsheet-XLSX-Reader-LibXML Spreadsheet-XLSX-Reader-LibXML-git
$ cd Spreadsheet-XLSX-Reader-LibXML-git
$ perl Makefile.PL
Checking if your kit is complete...
Warning: the following files are missing in your kit:
LICENSE
Please inform the author.
Generating a Unix-style Makefile
Writing Makefile for Spreadsheet::XLSX::Reader::LibXML
Writing MYMETA.yml and MYMETA.json
This might have been fixed for a release, but building from git: