I had an 'Exploding CEO's head crisis' at work today - no chance to do much -
The compiler options used are listed here in the image -
"Additional C Compiler Flags"
IF you are no longer getting 'nmake' errors, then I think you might have luck with 'either'
A - adding the path to cl.exe to your path
>path %path%;c:\Program Files\path_to_cl.exe <== obviously change this to match where cl.exe is - you may need to quote-enclose the path if it contains spaces. type 'path' at the command prompt to see if your command was successful. If you reboot - you will need to do it again OR modify your path.
B - copy cl.exe to c:\xampp\perl\bin.
Did you install YAML???
I think this is as far as I can detangle this -