title: How do I fix brew doctor errors?
body: <p>I'm very much a newbie when it comes to all this so forgive my incompetence.</p>
  
  <p>When I run brew Doctor, I get the following. Can someone help?</p>
  
  <pre class="lang-bsh prettyprint-override"><code>[/usr/local]$ brew doctor
  
  Error: Setting DYLD_LIBRARY_PATH can break dynamic linking.
  You should probably unset it.
  Error: Some keg-only formula are linked into the Cellar.
  Linking a keg-only formula, such as gettext, into the cellar with
  brew link f will cause other formulae to detect them during the
  ./configure step. This may cause problems when compiling those
  other formulae.
  
  Binaries provided by keg-only formulae may override system binaries
  with other strange results.
  
  You may wish to brew unlink these brews:
  
  libxml2
  
  Error: 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/libcharset.1.dylib /usr/local/lib/libfreetype.6.dylib /usr/local/lib/libjpeg.8.dylib /usr/local/lib/liblcms.1.0.19.dylib /usr/local/lib/libMagickCore.4.dylib /usr/local/lib/libMagickWand.4.dylib /usr/local/lib/libpng15.15.dylib /usr/local/lib/libtiff.3.dylib /usr/local/lib/libtiffxx.3.dylib /usr/local/lib/libwmf-0.2.7.1.0.dylib /usr/local/lib/libwmflite-0.2.7.0.1.dylib
  Error: 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/libcharset.la /usr/local/lib/libfreetype.la /usr/local/lib/libjpeg.la /usr/local/lib/liblcms.la /usr/local/lib/libMagickCore.la /usr/local/lib/libMagickWand.la /usr/local/lib/libpng15.la /usr/local/lib/libtiff.la /usr/local/lib/libtiffxx.la /usr/local/lib/libwmf.la /usr/local/lib/libwmflite.la
  Error: 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/freetype2.pc /usr/local/lib/pkgconfig/ImageMagick.pc /usr/local/lib/pkgconfig/lcms.pc /usr/local/lib/pkgconfig/libpng15.pc /usr/local/lib/pkgconfig/MagickCore.pc /usr/local/lib/pkgconfig/MagickWand.pc /usr/local/lib/pkgconfig/Wand.pc
  Error: 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/libcharset.a /usr/local/lib/libfreetype.a /usr/local/lib/libjpeg.a /usr/local/lib/liblcms.a /usr/local/lib/libpng15.a /usr/local/lib/libtiff.a /usr/local/lib/libtiffxx.a /usr/local/lib/libwmf.a /usr/local/lib/libwmflite.a
  Error: You have uncommitted modifications to Homebrew's core.
  Unless you know what you are doing, you should run:
  cd /usr/local &amp;&amp; git reset --hard
  Error: Some directories in your path end in a slash.
  Directories in your path should not end in a slash. This can break other
  doctor checks. The following directories should be edited:
  /usr/local/git/bin/
  [/usr/local]$
  </code></pre>