brew doctor

$ brew doctor
Warning: Unbrewed dylibs were found in /usr/local/lib
You have unbrewed dylibs in /usr/local/lib. If you didn't put them there on purpose,
they could cause problems when building Homebrew formulae.

Unexpected dylibs (delete if they are no longer needed):
    /usr/local/lib/libcord.1.dylib
    /usr/local/lib/libgc.1.dylib

/usr/bin is in your PATH before Homebrew's bin. This means that system-
provided programs will be used before Homebrew-provided ones. This is an
issue if you install, for instance, Python.

Consider editing your .bashrc to put:
  /usr/local/bin
ahead of /usr/bin in your $PATH.

You have a non-brew 'pkg-config' in your PATH:
  /Users/andrew/macports/bin/pkg-config

`./configure` may have problems finding brew-installed packages using
this other pkg-config.

Your pkg-config is not checking "/usr/X11/lib/pkgconfig" for packages.
Earlier versions of the pkg-config formula did not add this path
to the search path, which means that other formula may not be able
to find certain dependencies.

To resolve this issue, re-brew pkg-config with:
  brew rm pkg-config && brew install pkg-config

Some "config" scripts were found in your path, but not in system or Homebrew folders.

`./configure` scripts often look for *-config scripts to determine if software packages
are installed, and what additional flags to use when compiling and linking.

Having additional scripts in your path can confuse software installed via Homebrew if
the config script overrides a system or Homebrew provided script of the same name.

/Users/andrew/macports/bin
    ecl-config freetype-config GraphicsMagick++-config GraphicsMagick-config GraphicsMagickWand-config libpng-config libpng14-config ncurses5-config ncursesw5-config pdflib-config pkg-config xml2-config