brew doctor Warning: Unbrewed dylibs were found in /usr/local/lib

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I'm sort of new to programming and in the path of setting the environment ready under Mac OS X Yosemite I ran into some issues under the brew doctor command.

It says

Please note that these warnings are just used to help the Homebrew
maintainers with debugging if you file an issue. If everything you use
Homebrew for is working fine: please don't worry and just ignore them.
Thanks!

but I don't really know what to expect and to avoid future issues I'd like to see the output "Your system is ready to brew"

First I ran the brew purge command with the following output

horus:~ rsmendes$ brew prune 
Pruned 0 dead formulae Pruned 136
symbolic links and 4 directories from /usr/local

Now I'm getting dylibs warning. I've read that this is solved by removing this files, but also read that it is possible to break something, and I'm uncertain of how to proceed.

I'm also getting header, unbrewed .la, unbrewed .pc and unbrewed static libraries that all seem to be related to the dylibs mentioned.

Warning: Unbrewed dylibs were found in /usr/local/lib. If you didn't
put them there on purpose they could cause problems when building
Homebrew formulae, and may need to be deleted.

Unexpected dylibs:
    /usr/local/lib/libfuse4x.2.dylib
    /usr/local/lib/libntfs-3g.80.dylib
    /usr/local/lib/libntfs.9.0.0.dylib
    /usr/local/lib/libublio.1.dylib
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