I fixed builds that attempted to use the -w option when calling perl. The shell was treating it as a single command name rather than a command with a switch.
The easy way to fix this would be to do something similar to:
ln -s ./perl 'perl -w'
This will create a symbolic link named 'perl -w' allowing the build to work, in my case. I was running into this with trying to compile the library pango and it was annoying me, because I couldn't figure out where env was calling for the file 'perl -w' to change it. The -w switch only enables some additional warnings, so not entirely necessary.
Another option might be to create a script named 'perl -w' then have it call perl with the -w switch.
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