Should I _really_ remove dylibs after installing homebrew?

I just installed homebrew and saw a message from the install script that said I should consider removing the following "evil" dylibs as they might break builds. Has anyone done this? And if so, did you later find out that you actually needed them?

Here's the dylib list:

/usr/local/lib/CHBrowserView.dylib
/usr/local/lib/libgnsdk_musicid_file.dylib
/usr/local/lib/libgnsdk_sdkmanager.dylib
/usr/local/lib/libjson.0.0.1.dylib
/usr/local/lib/libmusicid_osx.dylib
/usr/local/lib/开发者_如何学运维libpcre.0.0.1.dylib
/usr/local/lib/libpcrecpp.0.0.0.dylib
/usr/local/lib/libpcreposix.0.0.0.dylib

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NO. If you have something in /usr/local/lib, in all likelihood its because you built it and installed it.

It's an annoying and egotistical error message for Brew to assume that any libraries in /usr/local/lib are 'evil' simply because Brew doesn't know about them.

It is possible that you might have an 'older' version that conflicts with something Brew builds, but.. guh. It'll be painfully obvious when the program dies. And more likely than not if the application tries to dyload it, it also means that when Brew is building things it'll try to link against the old lib anyway. As long as it's arch / version compatible it's no biggie.

It'll also be painfully obvious when something you built pre-Brew can't find the shared library you removed. And given that you may not have the source laying around (or remember how you configured it in the first place..)

I strongly suggest keeping the old libraries around.