Build Python v3.6.0 release on os/x from github sources, where brew has installed (co-reside w/ your other pythons)

build-pythonv3.6.0.sh

#!/usr/bin/env sh
# NOTE: keeping this gist for 3.6.0 release, because I want to keep 3.5 around for a bit too;
# Here is how I built Python v3.6.0b1...onward
# on OS/X, where brew is installed
# (and python2.7 and python3.5 installed by brew):

# make sure you have openssl installed (this is for installing pip)
# and a recent tcl-tk, if you're going to use idle
#   (see https://www.python.org/download/mac/tcltk/ for more info)
# If you have them installed, you might want to `brew upgrade` them.
# (uncomment if needed):
# brew install openssl
# brew install tcl-tk

# now, get python from either python.org - source zip -
# or github mirror;  I do the later:
# git clone [email protected]:python/cpython.git
# or
git fetch

git checkout 3.6   # or, git checkout -f ... the 3.6 branch
# if fetched / updated:
git pull

# search https://ht.python.org/cpython/tags
#  for the changeset to tag in the git mirror
# note: the changesets are numbered differently; I id manually like this:
# git log   # search for "Added tag v3.6.0b..." whatever the appropriate tag is
#git tag -a v3.6.0b1 4ce9f3c002bb598a203867aa084faf1914c76e73
#git checkout v3.6.0b1
#git tag -a v3.6.0b2 1ebb1d03bb17ad786a6e0751ca89336671ee694f
#git checkout v3.6.0b2
#git tag -a v3.6.0b3 a6a13f3b9b3a0bc4d832f6c8d292efa90dfb2549
#git checkout v3.6.0b3
#git tag -a v3.6.0b4 1ebb1d03bb17ad786a6e0751ca89336671ee694f
#git checkout v3.6.0b4
#git tag -a v3.6.0rc1 bb265131bf01ccc09f77991408fb7c92b013e324
#git checkout v3.6.0rc1
#git tag -a v3.6.0rc2 84f054c425e0636c4baf244718877e5d204140b0
#git checkout v3.6.0.rc2
git tag -a v3.6.0 21feef2e7b32cf469f2846ed602e7e19733d8d89
git checkout v3.6.0

# to build w/ brew built tcl-tk, modify setup.py to not look for
#   usual Apple system locations for X11
# - this will allow a successful build of idle3.6
patch -b setup.py setup.patch

# now - configure to use the brew'd openssl:
#   get the command line options to use the brew openssl:
# brew info openssl
# or this should give you the pattern for what you'll need:
# - I've tried to find what will get the brew-built tcl-tk to link, for idle3.6;
#   on at least one mac exporting the vars before running configure seemed to work, but not on another.
# Here's the latest change for you to try:
# combine output of two brew-info calls into one pipeline, then python for the output strings:
#  - if you're not using brew installed sqlite3, comment that out:
{ brew info openssl | grep -A 99 'build variables:';
  brew info tcl-tk  | grep -A 99 'build variables:';
  brew info sqlite3 | grep -A 99 'build variables:';
} | python -c '
import sys

cmds = {}
for line in sys.stdin:
    l = line.strip()
    if not l or line.startswith("build variables:"):
        continue
    k, v = l.split(maxsplit=1)
    k = k.rstrip(":")
    if not k in cmds:
        cmds[k] = []
    cmds[k].append(v)

mortar = " "
for k in cmds:
    if k.startswith("PKG_CONFIG_PATH"):
      continue
    print("export {}=\"{}\"".format( k, mortar.join(cmds[k]) ))
' | pbcopy   # this will put it in your paste-buffer; CMD-V paste into your shell
# end of script for env vars;

# My result, pasted in shell:
#  these are used by ./configure, and then picked up by make - double entering each.
#  You might want to unset these before make;  my idle builds still work on one mac, not another;
export LDFLAGS="-L/usr/local/opt/openssl/lib -L/usr/local/opt/tcl-tk/lib"
export CPPFLAGS="-I/usr/local/opt/openssl/include -I/usr/local/opt/tcl-tk/include"

./configure
#  or this - but it will run compilations on installation also:
#./configure --enable-optimizations

# so these flags don't show twice in the compilations - once from config file, once from env:
unset CPPFLAGS LDFLAGS

# build python:
make
make test

# you can get pip before you install:
curl -O https://bootstrap.pypa.io/get-pip.py
./python.exe get-pip.py
# This will install in /usr/local/bin as python3.6, etc.
#  so the commands won't collide with or replace any
#  homebrew installed python3.5
make altinstall

# check what was installed:
ls -lrt /usr/local/bin

# now, go play with v3.6.0

setup.patch

*** a/setup.py	2016-12-08 17:02:31.000000000 -0600
--- b/setup.py	2016-12-08 17:06:42.000000000 -0600
***************
*** 1774,1782 ****
          # Rather than complicate the code below, detecting and building
          # AquaTk is a separate method. Only one Tkinter will be built on
          # Darwin - either AquaTk, if it is found, or X11 based Tk.
-         if (host_platform == 'darwin' and
-             self.detect_tkinter_darwin(inc_dirs, lib_dirs)):
-             return
  
          # Assume we haven't found any of the libraries or include files
          # The versions with dots are used on Unix, and the versions without
--- 1774,1779 ----
***************
*** 1822,1843 ****
              if dir not in include_dirs:
                  include_dirs.append(dir)
  
-         # Check for various platform-specific directories
-         if host_platform == 'sunos5':
-             include_dirs.append('/usr/openwin/include')
-             added_lib_dirs.append('/usr/openwin/lib')
-         elif os.path.exists('/usr/X11R6/include'):
-             include_dirs.append('/usr/X11R6/include')
-             added_lib_dirs.append('/usr/X11R6/lib64')
-             added_lib_dirs.append('/usr/X11R6/lib')
-         elif os.path.exists('/usr/X11R5/include'):
-             include_dirs.append('/usr/X11R5/include')
-             added_lib_dirs.append('/usr/X11R5/lib')
-         else:
-             # Assume default location for X11
-             include_dirs.append('/usr/X11/include')
-             added_lib_dirs.append('/usr/X11/lib')
- 
          # If Cygwin, then verify that X is installed before proceeding
          if host_platform == 'cygwin':
              x11_inc = find_file('X11/Xlib.h', [], include_dirs)
--- 1819,1824 ----
***************
*** 1861,1870 ****
          if host_platform in ['aix3', 'aix4']:
              libs.append('ld')
  
-         # Finally, link with the X11 libraries (not appropriate on cygwin)
-         if host_platform != "cygwin":
-             libs.append('X11')
- 
          ext = Extension('_tkinter', ['_tkinter.c', 'tkappinit.c'],
                          define_macros=[('WITH_APPINIT', 1)] + defs,
                          include_dirs = include_dirs,
--- 1842,1847 ----

Fixed matplotlib and idle issues, by patching setup.py;

With a pip3.6 ptpython install/update, I've noticed that all links to ptpython command are updated to point to python3.6;
I have to edit the top line in the following (I want mine to point to release python3; I have a separate ptpython2):

• ptpython, ptipython
• ptpython3, ptipython3
• ptpython3.5, ptipython3.5