pip Install errors for bcrypt on OSX 10.10 Yosemite

[Michael Weems]

$ sudo pip install bcrypt
Downloading/unpacking bcrypt
  Downloading bcrypt-1.0.2.tar.gz (40kB): 40kB downloaded
  Running setup.py (path:/private/tmp/pip_build_root/bcrypt/setup.py) egg_info for package bcrypt
    Package libffi was not found in the pkg-config search path.
    Perhaps you should add the directory containing `libffi.pc'
    to the PKG_CONFIG_PATH environment variable
    No package 'libffi' found
    Package libffi was not found in the pkg-config search path.
    Perhaps you should add the directory containing `libffi.pc'
    to the PKG_CONFIG_PATH environment variable
    No package 'libffi' found
    Package libffi was not found in the pkg-config search path.
    Perhaps you should add the directory containing `libffi.pc'
    to the PKG_CONFIG_PATH environment variable
    No package 'libffi' found
    Package libffi was not found in the pkg-config search path.
    Perhaps you should add the directory containing `libffi.pc'
    to the PKG_CONFIG_PATH environment variable
    No package 'libffi' found
    Package libffi was not found in the pkg-config search path.
    Perhaps you should add the directory containing `libffi.pc'
    to the PKG_CONFIG_PATH environment variable
    No package 'libffi' found
    c/_cffi_backend.c:13:10: fatal error: 'ffi.h' file not found
    #include <ffi.h>
             ^
    1 error generated.
    Traceback (most recent call last):
      File "<string>", line 17, in <module>
      File "/private/tmp/pip_build_root/bcrypt/setup.py", line 104, in <module>
        "Programming Language :: Python :: 3.3",
      File "/usr/local/Cellar/python/2.7.8_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 111, in setup
        _setup_distribution = dist = klass(attrs)
      File "build/bdist.macosx-10.10-x86_64/egg/setuptools/dist.py", line 262, in __init__
      File "build/bdist.macosx-10.10-x86_64/egg/setuptools/dist.py", line 287, in fetch_build_eggs
      File "build/bdist.macosx-10.10-x86_64/egg/pkg_resources.py", line 631, in resolve
      File "build/bdist.macosx-10.10-x86_64/egg/pkg_resources.py", line 874, in best_match
      File "build/bdist.macosx-10.10-x86_64/egg/pkg_resources.py", line 886, in obtain
      File "build/bdist.macosx-10.10-x86_64/egg/setuptools/dist.py", line 338, in fetch_build_egg
      File "build/bdist.macosx-10.10-x86_64/egg/setuptools/command/easy_install.py", line 613, in easy_install
      File "build/bdist.macosx-10.10-x86_64/egg/setuptools/command/easy_install.py", line 643, in install_item
      File "build/bdist.macosx-10.10-x86_64/egg/setuptools/command/easy_install.py", line 833, in install_eggs
      File "build/bdist.macosx-10.10-x86_64/egg/setuptools/command/easy_install.py", line 1055, in build_and_install
      File "build/bdist.macosx-10.10-x86_64/egg/setuptools/command/easy_install.py", line 1043, in run_setup
    distutils.errors.DistutilsError: Setup script exited with error: command 'clang' failed with exit status 1
    Complete output from command python setup.py egg_info:
    Package libffi was not found in the pkg-config search path.

Perhaps you should add the directory containing `libffi.pc'

to the PKG_CONFIG_PATH environment variable

No package 'libffi' found

Package libffi was not found in the pkg-config search path.

Perhaps you should add the directory containing `libffi.pc'

to the PKG_CONFIG_PATH environment variable

No package 'libffi' found

Package libffi was not found in the pkg-config search path.

Perhaps you should add the directory containing `libffi.pc'

to the PKG_CONFIG_PATH environment variable

No package 'libffi' found

Package libffi was not found in the pkg-config search path.

Perhaps you should add the directory containing `libffi.pc'

to the PKG_CONFIG_PATH environment variable

No package 'libffi' found

Package libffi was not found in the pkg-config search path.

Perhaps you should add the directory containing `libffi.pc'

to the PKG_CONFIG_PATH environment variable

No package 'libffi' found

c/_cffi_backend.c:13:10: fatal error: 'ffi.h' file not found

#include <ffi.h>

         ^

1 error generated.

Traceback (most recent call last):

  File "<string>", line 17, in <module>

  File "/private/tmp/pip_build_root/bcrypt/setup.py", line 104, in <module>

    "Programming Language :: Python :: 3.3",

  File "/usr/local/Cellar/python/2.7.8_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 111, in setup

    _setup_distribution = dist = klass(attrs)

  File "build/bdist.macosx-10.10-x86_64/egg/setuptools/dist.py", line 262, in __init__

  File "build/bdist.macosx-10.10-x86_64/egg/setuptools/dist.py", line 287, in fetch_build_eggs

  File "build/bdist.macosx-10.10-x86_64/egg/pkg_resources.py", line 631, in resolve

  File "build/bdist.macosx-10.10-x86_64/egg/pkg_resources.py", line 874, in best_match

  File "build/bdist.macosx-10.10-x86_64/egg/pkg_resources.py", line 886, in obtain

  File "build/bdist.macosx-10.10-x86_64/egg/setuptools/dist.py", line 338, in fetch_build_egg

  File "build/bdist.macosx-10.10-x86_64/egg/setuptools/command/easy_install.py", line 613, in easy_install

  File "build/bdist.macosx-10.10-x86_64/egg/setuptools/command/easy_install.py", line 643, in install_item

  File "build/bdist.macosx-10.10-x86_64/egg/setuptools/command/easy_install.py", line 833, in install_eggs

  File "build/bdist.macosx-10.10-x86_64/egg/setuptools/command/easy_install.py", line 1055, in build_and_install

  File "build/bdist.macosx-10.10-x86_64/egg/setuptools/command/easy_install.py", line 1043, in run_setup

distutils.errors.DistutilsError: Setup script exited with error: command 'clang' failed with exit status 1

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /private/tmp/pip_build_root/bcrypt