How to fix my brew doctor errors - homebrew

Question

I'm trying to install Homebrew on my Mac so I can use PPSSPP, but I received a load of problems before finishing installation. How do I fix the unexpected things I have? Somebody please help.
Warning: gettext files detected at a system prefix
These files can cause compilation and link failures, especially if they
are compiled with improper architectures. Consider removing these files:
/usr/local/lib/libintl.dylib
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/libatk-1.0.0.2209.1.dylib
/usr/local/lib/libgdk-x11-2.0.0.1200.0.dylib
/usr/local/lib/libgdk_pixbuf-2.0.0.1200.0.dylib
/usr/local/lib/libgdk_pixbuf_xlib-2.0.0.1200.0.dylib
/usr/local/lib/libgio-2.0.0.0.0.dylib
/usr/local/lib/libGLEW.1.5.4.dylib
/usr/local/lib/libglib-2.0.0.1600.0.dylib
/usr/local/lib/libgmodule-2.0.0.1600.0.dylib
/usr/local/lib/libgobject-2.0.0.1600.0.dylib
/usr/local/lib/libgthread-2.0.0.1600.0.dylib
/usr/local/lib/libgtk-x11-2.0.0.1200.0.dylib
/usr/local/lib/libintl.8.0.2.dylib
/usr/local/lib/libjpeg.62.dylib
/usr/local/lib/libpango-1.0.0.2100.0.dylib
/usr/local/lib/libpangocairo-1.0.0.2100.0.dylib
/usr/local/lib/libpangoft2-1.0.0.2100.0.dylib
/usr/local/lib/libpangox-1.0.0.2100.0.dylib
/usr/local/lib/libpangoxft-1.0.0.2100.0.dylib
/usr/local/lib/libportaudio.2.0.0.dylib
/usr/local/lib/libSDL-1.2.0.dylib
/usr/local/lib/libz.1.2.5.dylib
Warning: Unbrewed .la files 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 .la files:
/usr/local/lib/libatk-1.0.la
/usr/local/lib/libgdk-x11-2.0.la
/usr/local/lib/libgdk_pixbuf-2.0.la
/usr/local/lib/libgdk_pixbuf_xlib-2.0.la
/usr/local/lib/libgio-2.0.la
/usr/local/lib/libglib-2.0.la
/usr/local/lib/libgmodule-2.0.la
/usr/local/lib/libgobject-2.0.la
/usr/local/lib/libgthread-2.0.la
/usr/local/lib/libgtk-x11-2.0.la
/usr/local/lib/libintl.la
/usr/local/lib/libjpeg.la
/usr/local/lib/libpango-1.0.la
/usr/local/lib/libpangocairo-1.0.la
/usr/local/lib/libpangoft2-1.0.la
/usr/local/lib/libpangox-1.0.la
/usr/local/lib/libpangoxft-1.0.la
/usr/local/lib/libportaudio.la
Warning: Unbrewed static libraries 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 static libraries:
/usr/local/lib/libGLEW.a
/usr/local/lib/libintl.a
/usr/local/lib/libjpeg.a
/usr/local/lib/libportaudio.a
/usr/local/lib/libz.a

Answer 1

Delete all unexpected files and run brew doctor again.
If everything is ok run then brew update.
Beware that if you have installed another package manager using the same location, this can break things.