C:\Perl\Language-Prolog-Yaswi-0.18>perl Makefile.PL
Set up gcc environment - 3.4.5 (mingw special)
Checking if your kit is complete...
Looks good
retrieving SWI-Prolog configuration:
  running 'plcon.exe -dump-runtime-variables'
'plcon.exe' is not recognized as an internal or external command,
operable program or batch file.
unable to run swi-prolog command 'plcon.exe': 256
Aborting...