The result of my `brew doctor`

doctor.txt

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/libpng14.14.dylib

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/libGraphicsMagick++.a
    /usr/local/lib/libGraphicsMagick.a
    /usr/local/lib/libGraphicsMagickWand.a
    /usr/local/lib/libpng14.a

Unbrewed .pc files were found in /usr/local/lib/pkgconfig.

If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected .pc files:
    /usr/local/lib/pkgconfig/GraphicsMagick++.pc
    /usr/local/lib/pkgconfig/libpng14.pc
    /usr/local/lib/pkgconfig/nodejs.pc

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/libGraphicsMagick++.la
    /usr/local/lib/libjpeg.la
    /usr/local/lib/libpng14.la

gettext was detected in your PREFIX.

The gettext provided by Homebrew is "keg-only", meaning it does not
get linked into your PREFIX by default.

If you `brew link gettext` then a large number of brews that don't
otherwise have a `depends_on 'gettext'` will pick up gettext anyway
during the `./configure` step.

If you have a non-Homebrew provided gettext, other problems will happen
especially if it wasn't compiled with the proper architectures.

$GREP_OPTIONS was set to "--color=always".
Having $GREP_OPTIONS set this way can cause CMake builds to fail.

Your Cellar & TEMP folders are on different volumes.

OS X won't move relative symlinks across volumes unless the target file
already exists.

Brews known to be affected by this are Git and Narwhal.

You should set the "HOMEBREW_TEMP" environmental variable to a suitable
folder on the same volume as your Cellar.