C:\Perl\Language-Prolog-Yaswi-0.18>perl Makefile.PL
Set up gcc environment - 3.4.5 (mingw special)
retrieving SWI-Prolog configuration:
  running 'plcon.exe -dump-runtime-variables'
    PLBASE: c:/program files/prolog
    PLARCH: i386-win32
    PLLIBS:
    PLLIB: libpl.lib
    PLCFLAGS: /MD /GX
    PLLDFLAGS:
    PLSOEXT: dll
    PLVERSION: 50664
    PLSHARED: yes
    PLTHREADS: yes

checking thread support in Perl and SWI-Prolog:
  thread support enabled

creating plconfig.c
Note (probably harmless): No library found for -lpl
Writing Makefile for Language::Prolog::Yaswi::Low
Writing Makefile for Language::Prolog::Yaswi