Mac/README - platform/external/python/cpython3 - Gitiles

 =========================
 Python on Mac OS X README
 =========================

 :Authors:
     Jack Jansen (2004-07),
     Ronald Oussoren (2010-04),
     Ned Deily (2012-06)

 :Version: 3.4.0

 This document provides a quick overview of some Mac OS X specific features in
 the Python distribution.

 OS X specific arguments to configure
 ====================================

 * ``--enable-framework[=DIR]``

   If this argument is specified the build will create a Python.framework rather
   than a traditional Unix install. See the section
   _`Building and using a framework-based Python on Mac OS X` for more
   information on frameworks.

   If the optional directory argument is specified the framework is installed
   into that directory. This can be used to install a python framework into
   your home directory::

      $ ./configure --enable-framework=/Users/ronald/Library/Frameworks
      $ make && make install

   This will install the framework itself in ``/Users/ronald/Library/Frameworks``,
   the applications in a subdirectory of ``/Users/ronald/Applications`` and the
   command-line tools in ``/Users/ronald/bin``.

 * ``--with-framework-name=NAME``

   Specify the name for the python framework, defaults to ``Python``. This option
   is only valid when ``--enable-framework`` is specified.

 * ``--enable-universalsdk[=PATH]``

   Create a universal binary build of Python. This can be used with both
   regular and framework builds.

   The optional argument specifies which OS X SDK should be used to perform the
   build.  If xcodebuild is available and configured, this defaults to
   the Xcode default MacOS X SDK, otherwise ``/Developer/SDKs/MacOSX.10.4u.sdk``
   if available or ``/`` if not.

   See the section _`Building and using a universal binary of Python on Mac OS X`
   for more information.

 * ``--with-univeral-archs=VALUE``

   Specify the kind of universal binary that should be created. This option is
   only valid when ``--enable-universalsdk`` is specified.  The default is
   ``32-bit`` if a building with a SDK that supports PPC, otherwise defaults
   to ``intel``.


 Building and using a universal binary of Python on Mac OS X
 ===========================================================

 1. What is a universal binary
 -----------------------------

 A universal binary build of Python contains object code for more than one
 CPU architecture.  A universal OS X executable file or library combines the
 architecture-specific code into one file and can therefore run at native
 speed on all supported architectures.  Universal files were introduced in
 OS X 10.4 to add support for Intel-based Macs to the existing PowerPC (PPC)
 machines.  In OS X 10.5 support was extended to 64-bit Intel and 64-bit PPC
 architectures.  It is possible to build Python with various combinations
 of architectures depending on the build tools and OS X version in use.

 2. How do I build a universal binary
 ------------------------------------

 You can enable universal binaries by specifying the "--enable-universalsdk"
 flag to configure::

   $ ./configure --enable-universalsdk
   $ make
   $ make install

 This flag can be used with a framework build of python, but also with a classic
 unix build. Universal builds were first supported with OS X 10.4 with Xcode 2.1
 and the 10.4u SDK.  Starting with Xcode 3 and OS X 10.5, more configurations are
 available.

 In general, universal builds depend on specific features provided by the
 Apple-supplied compilers and other build tools included in Apple's Xcode
 development tools.  You should install Xcode and the command line tools
 component appropriate for the OS X release you are running on.  See the
 Python Developer's Guide (http://docs.python.org/devguide/setup.html)
 for more information.

 2.1 Flavors of universal binaries
 .................................

 It is possible to build a number of flavors of the universal binary build,
 the default is a 32-bit only binary (i386 and ppc) in build environments that
 support ppc (10.4 with Xcode 2, 10.5 and 10.6 with Xcode 3) or an
 Intel-32/-64-bit binary (i386 and X86_64) in build environments that do not
 support ppc (Xcode 4 on 10.6 and later systems).  The flavor can be specified
 using the configure option ``--with-universal-archs=VALUE``. The following
 values are available:

   * ``intel``:	  ``i386``, ``x86_64``

   * ``intel-32``: ``i386``

   * ``32-bit``:   ``ppc``, ``i386``

   * ``3-way``:	  ``i386``, ``x86_64``, ``ppc``

   * ``64-bit``:   ``ppc64``, ``x86_64``

   * ``all``:      ``ppc``, ``ppc64``, ``i386``, ``x86_64``

 To build a universal binary that includes a 64-bit architecture, you must build
 on a system running OS X 10.5 or later.  The ``all`` and ``64-bit`` flavors can
 only be built with an 10.5 SDK because ``ppc64`` support was only included with
 OS X 10.5.  Although legacy ``ppc`` support was included with Xcode 3 on OS X
 10.6, it was removed in Xcode 4, versions of which were released on OS X 10.6
 and which is the standard for OS X 10.7.  To summarize, the
 following combinations of SDKs and universal-archs flavors are available:

   * 10.4u SDK with Xcode 2 supports ``32-bit`` only

   * 10.5 SDK with Xcode 3.1.x supports all flavors

   * 10.6 SDK with Xcode 3.2.x supports ``intel``, ``3-way``, and ``32-bit``

   * 10.6 SDK with Xcode 4 supports ``intel`` only

   * 10.7 and 10.8 SDKs with Xcode 4 support ``intel`` only

   * 10.8 and 10.9 SDKs with Xcode 5 support ``intel`` only

 The makefile for a framework build will also install ``python3.4-32``
 binaries when the universal architecture includes at least one 32-bit
 architecture (that is, for all flavors but ``64-bit``).

 Running a specific architecture
 ...............................

 You can run code using a specific architecture using the ``arch`` command::

    $ arch -i386 python

 Or to explicitly run in 32-bit mode, regardless of the machine hardware::

    $ arch -i386 -ppc python

 NOTE: When you're using a framework install of Python this requires at least
 Python 2.7 or 3.2, in earlier versions the python (and pythonw) commands are
 wrapper tools that execute the real interpreter without ensuring that the
 real interpreter runs with the same architecture.

 Using ``arch`` is not a perfect solution as the selected architecture will
 not automatically carry through to subprocesses launched by programs and tests
 under that Python.  If you want to ensure that Python interpreters launched in
 subprocesses also run in 32-bit-mode if the main interpreter does, use
 a ``python3.4-32`` binary and use the value of ``sys.executable`` as the
 ``subprocess`` ``Popen`` executable value.

 Building and using a framework-based Python on Mac OS X.
 ========================================================


 1. Why would I want a framework Python instead of a normal static Python?
 --------------------------------------------------------------------------

 The main reason is because you want to create GUI programs in Python. With the
 exception of X11/XDarwin-based GUI toolkits all GUI programs need to be run
 from a Mac OS X application bundle (".app").

 While it is technically possible to create a .app without using frameworks you
 will have to do the work yourself if you really want this.

 A second reason for using frameworks is that they put Python-related items in
 only two places: "/Library/Framework/Python.framework" and
 "/Applications/Python <VERSION>" where ``<VERSION>`` can be e.g. "3.4",
 "2.7", etc.  This simplifies matters for users installing
 Python from a binary distribution if they want to get rid of it again. Moreover,
 due to the way frameworks work, a user without admin privileges can install a
 binary distribution in his or her home directory without recompilation.

 2. How does a framework Python differ from a normal static Python?
 ------------------------------------------------------------------

 In everyday use there is no difference, except that things are stored in
 a different place. If you look in /Library/Frameworks/Python.framework
 you will see lots of relative symlinks, see the Apple documentation for
 details. If you are used to a normal unix Python file layout go down to
 Versions/Current and you will see the familiar bin and lib directories.

 3. Do I need extra packages?
 ----------------------------

 Yes, probably.  If you want Tkinter support you need to get the OS X AquaTk
 distribution, this is installed by default on Mac OS X 10.4 or later.  Be
 aware, though, that the Cocoa-based AquaTk's supplied starting with OS X
 10.6 have proven to be unstable.  If possible, you should consider
 installing a newer version before building on OS X 10.6 or later, such as
 the ActiveTcl 8.5.  See http://www.python.org/download/mac/tcltk/.  If you
 are building with an SDK, ensure that the newer Tcl and Tk frameworks are
 seen in the SDK's ``Library/Frameworks`` directory; you may need to
 manually create symlinks to their installed location, ``/Library/Frameworks``.
 If you want wxPython you need to get that.
 If you want Cocoa you need to get PyObjC.

 4. How do I build a framework Python?
 -------------------------------------

 This directory contains a Makefile that will create a couple of python-related
 applications (full-blown OS X .app applications, that is) in
 "/Applications/Python <VERSION>", and a hidden helper application Python.app
 inside the Python.framework, and unix tools including "python" into
 /usr/local/bin.  In addition it has a target "installmacsubtree" that installs
 the relevant portions of the Mac subtree into the Python.framework.

 It is normally invoked indirectly through the main Makefile, as the last step
 in the sequence

  1. ./configure --enable-framework

  2. make

  3. make install

 This sequence will put the framework in ``/Library/Framework/Python.framework``,
 the applications in ``/Applications/Python <VERSION>`` and the unix tools in
 ``/usr/local/bin``.

 Installing in another place, for instance ``$HOME/Library/Frameworks`` if you
 have no admin privileges on your machine, is possible. This can be accomplished
 by configuring with ``--enable-framework=$HOME/Library/Frameworks``.
 The other two directories will then also be installed in your home directory,
 at ``$HOME/Applications/Python-<VERSION>`` and ``$HOME/bin``.

 If you want to install some part, but not all, read the main Makefile. The
 frameworkinstall is composed of a couple of sub-targets that install the
 framework itself, the Mac subtree, the applications and the unix tools.

 There is an extra target frameworkinstallextras that is not part of the
 normal frameworkinstall which installs the Tools directory into
 "/Applications/Python <VERSION>", this is useful for binary
 distributions.

 What do all these programs do?
 ===============================

 "IDLE.app" is an integrated development environment for Python: editor,
 debugger, etc.

 "Python Launcher.app" is a helper application that will handle things when you
 double-click a .py, .pyc or .pyw file. For the first two it creates a Terminal
 window and runs the scripts with the normal command-line Python. For the
 latter it runs the script in the Python.app interpreter so the script can do
 GUI-things. Keep the ``Option`` key depressed while dragging or double-clicking
 a script to set runtime options. These options can be set persistently
 through Python Launcher's preferences dialog.

 The program ``pythonx.x`` runs python scripts from the command line.
 Previously, various compatibility aliases were also installed, including
 ``pythonwx.x`` which in early releases of Python on OS X was required to run
 GUI programs.  As of 3.4.0, the ``pythonwx.x`` aliases are no longer installed.

 How do I create a binary distribution?
 ======================================

 Download and unpack the source release from http://www.python.org/download/.
 Go to the directory ``Mac/BuildScript``. There you will find a script
 ``build-installer.py`` that does all the work. This will download and build
 a number of 3rd-party libaries, configures and builds a framework Python,
 installs it, creates the installer package files and then packs this in a
 DMG image.  The script also builds an HTML copy of the current Python
 documentation set for this release for inclusion in the framework.  The
 installer package will create links to the documentation for use by IDLE,
 pydoc, shell users, and Finder user.

 The script will build a universal binary so you'll therefore have to run this
 script on Mac OS X 10.4 or later and with Xcode 2.1 or later installed.
 However, the Python build process itself has several build dependencies not
 available out of the box with OS X 10.4 so you may have to install
 additional software beyond what is provided with Xcode 2.  OS X 10.5
 provides a recent enough system Python (in ``/usr/bin``) to build
 the Python documentation set.  It should be possible to use SDKs and/or older
 versions of Xcode to build installers that are compatible with older systems
 on a newer system but this may not be completely foolproof so the resulting
 executables, shared libraries, and ``.so`` bundles should be carefully
 examined and tested on all supported systems for proper dynamic linking
 dependencies.  It is safest to build the distribution on a system running the
 minimum OS X version supported.

 All of this is normally done completely isolated in /tmp/_py, so it does not
 use your normal build directory nor does it install into /.

 Because of the way the script locates the files it needs you have to run it
 from within the BuildScript directory. The script accepts a number of
 command-line arguments, run it with --help for more information.

 Configure warnings
 ==================

 The configure script sometimes emits warnings like the one below::

    configure: WARNING: libintl.h: present but cannot be compiled
    configure: WARNING: libintl.h:     check for missing prerequisite headers?
    configure: WARNING: libintl.h: see the Autoconf documentation
    configure: WARNING: libintl.h:     section "Present But Cannot Be Compiled"
    configure: WARNING: libintl.h: proceeding with the preprocessor's result
    configure: WARNING: libintl.h: in the future, the compiler will take precedence
    configure: WARNING:     ## -------------------------------------- ##
    configure: WARNING:     ## Report this to http://bugs.python.org/ ##
    configure: WARNING:     ## -------------------------------------- ##

 This almost always means you are trying to build a universal binary for
 Python and have libraries in ``/usr/local`` that don't contain the required
 architectures. Temporarily move ``/usr/local`` aside to finish the build.


 Uninstalling a framework install, including the binary installer
 ================================================================

 Uninstalling a framework can be done by manually removing all bits that got installed.
 That's true for both installations from source and installations using the binary installer.
 OS X does not provide a central uninstaller.

 The main bit of a framework install is the framework itself, installed in
 ``/Library/Frameworks/Python.framework``. This can contain multiple versions
 of Python, if you want to remove just one version you have to remove the
 version-specific subdirectory: ``/Library/Frameworks/Python.framework/Versions/X.Y``.
 If you do that, ensure that ``/Library/Frameworks/Python.framework/Versions/Current``
 is a symlink that points to an installed version of Python.

 A framework install also installs some applications in ``/Applications/Python X.Y``,

 And lastly a framework installation installs files in ``/usr/local/bin``, all of
 them symbolic links to files in ``/Library/Frameworks/Python.framework/Versions/X.Y/bin``.


 Resources
 =========

   *  http://www.python.org/download/mac/

   *  http://www.python.org/community/sigs/current/pythonmac-sig/

   *  http://docs.python.org/devguide/
	=========================
	Python on Mac OS X README
	=========================

	:Authors:
	Jack Jansen (2004-07),
	Ronald Oussoren (2010-04),
	Ned Deily (2012-06)

	:Version: 3.4.0

	This document provides a quick overview of some Mac OS X specific features in
	the Python distribution.

	OS X specific arguments to configure
	====================================

	* ``--enable-framework[=DIR]``

	If this argument is specified the build will create a Python.framework rather
	than a traditional Unix install. See the section
	_`Building and using a framework-based Python on Mac OS X` for more
	information on frameworks.

	If the optional directory argument is specified the framework is installed
	into that directory. This can be used to install a python framework into
	your home directory::

	$ ./configure --enable-framework=/Users/ronald/Library/Frameworks
	$ make && make install

	This will install the framework itself in ``/Users/ronald/Library/Frameworks``,
	the applications in a subdirectory of ``/Users/ronald/Applications`` and the
	command-line tools in ``/Users/ronald/bin``.

	* ``--with-framework-name=NAME``

	Specify the name for the python framework, defaults to ``Python``. This option
	is only valid when ``--enable-framework`` is specified.

	* ``--enable-universalsdk[=PATH]``

	Create a universal binary build of Python. This can be used with both
	regular and framework builds.

	The optional argument specifies which OS X SDK should be used to perform the
	build. If xcodebuild is available and configured, this defaults to
	the Xcode default MacOS X SDK, otherwise ``/Developer/SDKs/MacOSX.10.4u.sdk``
	if available or ``/`` if not.

	See the section _`Building and using a universal binary of Python on Mac OS X`
	for more information.

	* ``--with-univeral-archs=VALUE``

	Specify the kind of universal binary that should be created. This option is
	only valid when ``--enable-universalsdk`` is specified. The default is
	``32-bit`` if a building with a SDK that supports PPC, otherwise defaults
	to ``intel``.


	Building and using a universal binary of Python on Mac OS X
	===========================================================

	1. What is a universal binary
	-----------------------------

	A universal binary build of Python contains object code for more than one
	CPU architecture. A universal OS X executable file or library combines the
	architecture-specific code into one file and can therefore run at native
	speed on all supported architectures. Universal files were introduced in
	OS X 10.4 to add support for Intel-based Macs to the existing PowerPC (PPC)
	machines. In OS X 10.5 support was extended to 64-bit Intel and 64-bit PPC
	architectures. It is possible to build Python with various combinations
	of architectures depending on the build tools and OS X version in use.

	2. How do I build a universal binary
	------------------------------------

	You can enable universal binaries by specifying the "--enable-universalsdk"
	flag to configure::

	$ ./configure --enable-universalsdk
	$ make
	$ make install

	This flag can be used with a framework build of python, but also with a classic
	unix build. Universal builds were first supported with OS X 10.4 with Xcode 2.1
	and the 10.4u SDK. Starting with Xcode 3 and OS X 10.5, more configurations are
	available.

	In general, universal builds depend on specific features provided by the
	Apple-supplied compilers and other build tools included in Apple's Xcode
	development tools. You should install Xcode and the command line tools
	component appropriate for the OS X release you are running on. See the
	Python Developer's Guide (http://docs.python.org/devguide/setup.html)
	for more information.

	2.1 Flavors of universal binaries
	.................................

	It is possible to build a number of flavors of the universal binary build,
	the default is a 32-bit only binary (i386 and ppc) in build environments that
	support ppc (10.4 with Xcode 2, 10.5 and 10.6 with Xcode 3) or an
	Intel-32/-64-bit binary (i386 and X86_64) in build environments that do not
	support ppc (Xcode 4 on 10.6 and later systems). The flavor can be specified
	using the configure option ``--with-universal-archs=VALUE``. The following
	values are available:

	* ``intel``: ``i386``, ``x86_64``

	* ``intel-32``: ``i386``

	* ``32-bit``: ``ppc``, ``i386``

	* ``3-way``: ``i386``, ``x86_64``, ``ppc``

	* ``64-bit``: ``ppc64``, ``x86_64``

	* ``all``: ``ppc``, ``ppc64``, ``i386``, ``x86_64``

	To build a universal binary that includes a 64-bit architecture, you must build
	on a system running OS X 10.5 or later. The ``all`` and ``64-bit`` flavors can
	only be built with an 10.5 SDK because ``ppc64`` support was only included with
	OS X 10.5. Although legacy ``ppc`` support was included with Xcode 3 on OS X
	10.6, it was removed in Xcode 4, versions of which were released on OS X 10.6
	and which is the standard for OS X 10.7. To summarize, the
	following combinations of SDKs and universal-archs flavors are available:

	* 10.4u SDK with Xcode 2 supports ``32-bit`` only

	* 10.5 SDK with Xcode 3.1.x supports all flavors

	* 10.6 SDK with Xcode 3.2.x supports ``intel``, ``3-way``, and ``32-bit``

	* 10.6 SDK with Xcode 4 supports ``intel`` only

	* 10.7 and 10.8 SDKs with Xcode 4 support ``intel`` only

	* 10.8 and 10.9 SDKs with Xcode 5 support ``intel`` only

	The makefile for a framework build will also install ``python3.4-32``
	binaries when the universal architecture includes at least one 32-bit
	architecture (that is, for all flavors but ``64-bit``).

	Running a specific architecture
	...............................

	You can run code using a specific architecture using the ``arch`` command::

	$ arch -i386 python

	Or to explicitly run in 32-bit mode, regardless of the machine hardware::

	$ arch -i386 -ppc python

	NOTE: When you're using a framework install of Python this requires at least
	Python 2.7 or 3.2, in earlier versions the python (and pythonw) commands are
	wrapper tools that execute the real interpreter without ensuring that the
	real interpreter runs with the same architecture.

	Using ``arch`` is not a perfect solution as the selected architecture will
	not automatically carry through to subprocesses launched by programs and tests
	under that Python. If you want to ensure that Python interpreters launched in
	subprocesses also run in 32-bit-mode if the main interpreter does, use
	a ``python3.4-32`` binary and use the value of ``sys.executable`` as the
	``subprocess`` ``Popen`` executable value.

	Building and using a framework-based Python on Mac OS X.
	========================================================


	1. Why would I want a framework Python instead of a normal static Python?
	--------------------------------------------------------------------------

	The main reason is because you want to create GUI programs in Python. With the
	exception of X11/XDarwin-based GUI toolkits all GUI programs need to be run
	from a Mac OS X application bundle (".app").

	While it is technically possible to create a .app without using frameworks you
	will have to do the work yourself if you really want this.

	A second reason for using frameworks is that they put Python-related items in
	only two places: "/Library/Framework/Python.framework" and
	"/Applications/Python <VERSION>" where ``<VERSION>`` can be e.g. "3.4",
	"2.7", etc. This simplifies matters for users installing
	Python from a binary distribution if they want to get rid of it again. Moreover,
	due to the way frameworks work, a user without admin privileges can install a
	binary distribution in his or her home directory without recompilation.

	2. How does a framework Python differ from a normal static Python?
	------------------------------------------------------------------

	In everyday use there is no difference, except that things are stored in
	a different place. If you look in /Library/Frameworks/Python.framework
	you will see lots of relative symlinks, see the Apple documentation for
	details. If you are used to a normal unix Python file layout go down to
	Versions/Current and you will see the familiar bin and lib directories.

	3. Do I need extra packages?
	----------------------------

	Yes, probably. If you want Tkinter support you need to get the OS X AquaTk
	distribution, this is installed by default on Mac OS X 10.4 or later. Be
	aware, though, that the Cocoa-based AquaTk's supplied starting with OS X
	10.6 have proven to be unstable. If possible, you should consider
	installing a newer version before building on OS X 10.6 or later, such as
	the ActiveTcl 8.5. See http://www.python.org/download/mac/tcltk/. If you
	are building with an SDK, ensure that the newer Tcl and Tk frameworks are
	seen in the SDK's ``Library/Frameworks`` directory; you may need to
	manually create symlinks to their installed location, ``/Library/Frameworks``.
	If you want wxPython you need to get that.
	If you want Cocoa you need to get PyObjC.

	4. How do I build a framework Python?
	-------------------------------------

	This directory contains a Makefile that will create a couple of python-related
	applications (full-blown OS X .app applications, that is) in
	"/Applications/Python <VERSION>", and a hidden helper application Python.app
	inside the Python.framework, and unix tools including "python" into
	/usr/local/bin. In addition it has a target "installmacsubtree" that installs
	the relevant portions of the Mac subtree into the Python.framework.

	It is normally invoked indirectly through the main Makefile, as the last step
	in the sequence

	1. ./configure --enable-framework

	2. make

	3. make install

	This sequence will put the framework in ``/Library/Framework/Python.framework``,
	the applications in ``/Applications/Python <VERSION>`` and the unix tools in
	``/usr/local/bin``.

	Installing in another place, for instance ``$HOME/Library/Frameworks`` if you
	have no admin privileges on your machine, is possible. This can be accomplished
	by configuring with ``--enable-framework=$HOME/Library/Frameworks``.
	The other two directories will then also be installed in your home directory,
	at ``$HOME/Applications/Python-<VERSION>`` and ``$HOME/bin``.

	If you want to install some part, but not all, read the main Makefile. The
	frameworkinstall is composed of a couple of sub-targets that install the
	framework itself, the Mac subtree, the applications and the unix tools.

	There is an extra target frameworkinstallextras that is not part of the
	normal frameworkinstall which installs the Tools directory into
	"/Applications/Python <VERSION>", this is useful for binary
	distributions.

	What do all these programs do?
	===============================

	"IDLE.app" is an integrated development environment for Python: editor,
	debugger, etc.

	"Python Launcher.app" is a helper application that will handle things when you
	double-click a .py, .pyc or .pyw file. For the first two it creates a Terminal
	window and runs the scripts with the normal command-line Python. For the
	latter it runs the script in the Python.app interpreter so the script can do
	GUI-things. Keep the ``Option`` key depressed while dragging or double-clicking
	a script to set runtime options. These options can be set persistently
	through Python Launcher's preferences dialog.

	The program ``pythonx.x`` runs python scripts from the command line.
	Previously, various compatibility aliases were also installed, including
	``pythonwx.x`` which in early releases of Python on OS X was required to run
	GUI programs. As of 3.4.0, the ``pythonwx.x`` aliases are no longer installed.

	How do I create a binary distribution?
	======================================

	Download and unpack the source release from http://www.python.org/download/.
	Go to the directory ``Mac/BuildScript``. There you will find a script
	``build-installer.py`` that does all the work. This will download and build
	a number of 3rd-party libaries, configures and builds a framework Python,
	installs it, creates the installer package files and then packs this in a
	DMG image. The script also builds an HTML copy of the current Python
	documentation set for this release for inclusion in the framework. The
	installer package will create links to the documentation for use by IDLE,
	pydoc, shell users, and Finder user.

	The script will build a universal binary so you'll therefore have to run this
	script on Mac OS X 10.4 or later and with Xcode 2.1 or later installed.
	However, the Python build process itself has several build dependencies not
	available out of the box with OS X 10.4 so you may have to install
	additional software beyond what is provided with Xcode 2. OS X 10.5
	provides a recent enough system Python (in ``/usr/bin``) to build
	the Python documentation set. It should be possible to use SDKs and/or older
	versions of Xcode to build installers that are compatible with older systems
	on a newer system but this may not be completely foolproof so the resulting
	executables, shared libraries, and ``.so`` bundles should be carefully
	examined and tested on all supported systems for proper dynamic linking
	dependencies. It is safest to build the distribution on a system running the
	minimum OS X version supported.

	All of this is normally done completely isolated in /tmp/_py, so it does not
	use your normal build directory nor does it install into /.

	Because of the way the script locates the files it needs you have to run it
	from within the BuildScript directory. The script accepts a number of
	command-line arguments, run it with --help for more information.

	Configure warnings
	==================

	The configure script sometimes emits warnings like the one below::

	configure: WARNING: libintl.h: present but cannot be compiled
	configure: WARNING: libintl.h: check for missing prerequisite headers?
	configure: WARNING: libintl.h: see the Autoconf documentation
	configure: WARNING: libintl.h: section "Present But Cannot Be Compiled"
	configure: WARNING: libintl.h: proceeding with the preprocessor's result
	configure: WARNING: libintl.h: in the future, the compiler will take precedence
	configure: WARNING: ## -------------------------------------- ##
	configure: WARNING: ## Report this to http://bugs.python.org/ ##
	configure: WARNING: ## -------------------------------------- ##

	This almost always means you are trying to build a universal binary for
	Python and have libraries in ``/usr/local`` that don't contain the required
	architectures. Temporarily move ``/usr/local`` aside to finish the build.


	Uninstalling a framework install, including the binary installer
	================================================================

	Uninstalling a framework can be done by manually removing all bits that got installed.
	That's true for both installations from source and installations using the binary installer.
	OS X does not provide a central uninstaller.

	The main bit of a framework install is the framework itself, installed in
	``/Library/Frameworks/Python.framework``. This can contain multiple versions
	of Python, if you want to remove just one version you have to remove the
	version-specific subdirectory: ``/Library/Frameworks/Python.framework/Versions/X.Y``.
	If you do that, ensure that ``/Library/Frameworks/Python.framework/Versions/Current``
	is a symlink that points to an installed version of Python.

	A framework install also installs some applications in ``/Applications/Python X.Y``,

	And lastly a framework installation installs files in ``/usr/local/bin``, all of
	them symbolic links to files in ``/Library/Frameworks/Python.framework/Versions/X.Y/bin``.


	Resources
	=========

	* http://www.python.org/download/mac/

	* http://www.python.org/community/sigs/current/pythonmac-sig/

	* http://docs.python.org/devguide/