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   #!/bin/sh -- # -*- perl -*-
   eval 'exec <perlpath>/bin/perl -S $0 ${1+"$@"}'
     if 0;

   #!<perlpath>/bin/perl

#!/bin/sh
## this is the wrapper file: <toolroot>/perl-5.8.8/bin/perl
...
else
   die "Couldn't find $tool executable:  \"$exe\".";
fi