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'PREREQ_FATAL' is not a known MakeMaker parameter name.
Writing Makefile for File::Defrag
cp Defrag.pm blib\lib\File\Defrag.pm
	D:\cpanrun\build\5-6-1\bin\perl.exe -Id:\cpanrun\build\5-6-1\lib -Id:\cpanrun\build\5-6-1\liError: 'const char *' not in typemap in Defrag.xs, line 50
Error: 'PerlIO *' not in typemap in Defrag.xs, line 89
Error: 'PerlIO *' not in typemap in Defrag.xs, line 89
Error: 'PerlIO *' not in typemap in Defrag.xs, line 91
NMAKE : fatal error U1077: 'D:\cpanrun\build\5-6-1\bin\perl.exe' : return code '0x1'
Stop.