brew doctor

gistfile1.txt

Warning: You may have installed MacGPG2 via the package installer.
Several other checks in this script will turn up problems, such as stray
dylibs in /usr/local and permissions issues with share and man in /usr/local/.
Warning: /usr/bin occurs before /usr/local/bin
This means that system-provided programs will be used instead of those
provided by Homebrew. The following tools exist at both paths:

    2to3
    awk
    cdiff
    config_data
    crc32
    ctags
    ptar
    ptardiff
    sqlite3

Consider amending your PATH so that /usr/local/bin
occurs before /usr/bin in your PATH.
Warning: Homebrew's sbin was not found in your path.
Consider amending your PATH variable so it contains:
  /usr/local/sbin