The "bug"/undocumented feature/behaviour is in the Pugs distribution, in the subroutine assert_ghc:

sub assert_ghc {
    my $self = shift;
    my $ghc = $self->can_run($ENV{GHC} || ( 'ghc' . $Config{_exe} ) );

...

[download]

It tries to find the ghc executable, or whatever you export in your environment as GHC. So in theory, the installation should work for you if you do:

GHC=`which ghc-6.4.1`
export GHC
cpan Pugs

[download]

In reply to Re: Installing Pugs via CPAN shell (How to call specific ghc version) by Corion
in thread Installing Pugs via CPAN shell (How to call specific ghc version) by neversaint

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