Homebrew graphviz warning

gistfile1.txt

Dai-ni-Andrew-Grimms-iMac:~ agrimm$ brew install graphviz
Warning: Formula will not build with Clang, trying LLVM
==> Downloading http://www.graphviz.org/pub/graphviz/stable/SOURCES/graphviz-2.28.0.tar.gz
Already downloaded: /Library/Caches/Homebrew/graphviz-2.28.0.tar.gz
==> Downloading patches
######################################################################## 100.0%
==> Patching
patching file macosx/graphviz.xcodeproj/project.pbxproj
patching file lib/gvc/Makefile.in
patching file plugin/quartz/Makefile.in
==> ./configure --disable-debug --prefix=/usr/local/Cellar/graphviz/2.28.0 --with-qt=no --with-quartz --without-pangocairo
==> make install
==> xcodebuild -configuration Release SYMROOT=build PREFIX=/usr/local/Cellar/graphviz/2.28.0 ONLY_ACTIVE_ARCH=YES
==> Caveats
    Graphviz.app was installed in:
      /usr/local/Cellar/graphviz/2.28.0

    To symlink into ~/Applications, you can do:
      brew linkapps
Warning: Non-executables were installed to "bin".
Installing non-executables to "bin" is bad practice.
The offending files are:
/usr/local/Cellar/graphviz/2.28.0/bin/gvmap.sh
==> Summary
/usr/local/Cellar/graphviz/2.28.0: 464 files, 14M, built in 72 seconds
Dai-ni-Andrew-Grimms-iMac:~ agrimm$ brew install -v $FORMULA 2>&1 | pbcopy
Dai-ni-Andrew-Grimms-iMac:~ agrimm$ brew install -v graphviz 2>&1 | pbcopy
Dai-ni-Andrew-Grimms-iMac:~ agrimm$ brew install -v graphviz
Error: graphviz-2.28.0 already installed
Dai-ni-Andrew-Grimms-iMac:~ agrimm$ brew doctor

Error: /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:

    git
    git-cvsserver
    git-receive-pack
    git-shell
    git-upload-archive
    git-upload-pack
    gitk

Consider amending your PATH so that /usr/local/bin
is ahead of /usr/bin in your PATH.

Dai-ni-Andrew-Grimms-iMac:~ agrimm$ brew --config
HOMEBREW_VERSION: 0.9.2
HEAD: f08622f13dc287338be3741101ad0865a693c98d
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
CPU: quad-core 64-bit sandybridge
OS X: 10.7.4-x86_64
Xcode: 4.3.3
CLT: 1.0.0.9000000000.1.1249367152
GCC-4.0: N/A
GCC-4.2: build 5666
LLVM: build 2336
Clang: 3.1 build 318
MacPorts or Fink? false
X11: 2.6.4 @ /usr/X11
System Ruby: 1.8.7-357
Which Perl:   /usr/bin/perl
Which Python: /usr/bin/python
Which Ruby:   /Users/agrimm/.rbenv/shims/ruby