install python2.6 on ubuntu12.04

ubuntu12.04_python2.6.md

###depencies

http://www.noah.org/wiki/Build_Python_2.6_on_Ubuntu

libssl-dev
libreadline-dev
aptitude -y -q install libc6-dev
aptitude -y -q install libffi4-dev
aptitude -y -q install libncurses5-dev
aptitude -y -q install libncursesw5-dev
aptitude -y -q install libbz2-dev
aptitude -y -q install libsqlite3-dev
aptitude -y -q install libgdbm-dev
aptitude -y -q install tcl8.4-dev
aptitude -y -q install tk8.4-dev

###patch and install

as ubuntu12.04 use python 2.7.3 by defaut, we should do some patches

http://ubuntuforums.org/showthread.php?t=1976837

1. get python 2.6.8 source

    $ wget http://www.python.org/ftp/python/2.6.8/Python-2.6.8.tar.bz2
    $ tar xjvf Python-2.6.8.tar.bz2
    $ cd Python-2.6.8

2. patch setup.py

   setup.patch

    --- setup.py       2012-04-10 17:32:11.000000000 +0200
    +++ setup.py       2012-05-08 12:42:23.893052724 +0200
    @@ -410,6 +410,7 @@
             lib_dirs = self.compiler.library_dirs + [
                 '/lib64', '/usr/lib64',
                 '/lib', '/usr/lib',
    +            '/usr/lib/x86_64-linux-gnu'
                 ]
             inc_dirs = self.compiler.include_dirs + ['/usr/include']
             exts = []

3. patch _ssl.c

   python 2.7.3 seems not support sslv2

    $ vim /usr/lib/python2.7/ssl.py

   then you can see

    from _ssl import PROTOCOL_SSLv3, PROTOCOL_SSLv23, PROTOCOL_TLSv1
    _PROTOCOL_NAMES = {
        PROTOCOL_TLSv1: "TLSv1",
        PROTOCOL_SSLv23: "SSLv23",
        PROTOCOL_SSLv3: "SSLv3",
    }
    try:
        from _ssl import PROTOCOL_SSLv2
    except ImportError:
        pass
    else:
        _PROTOCOL_NAMES[PROTOCOL_SSLv2] = "SSLv2"

   _ssl.patch

    --- Modules/_ssl.c      2012-04-10 17:32:09.000000000 +0200
    +++ Modules/_ssl.c      2012-05-08 17:50:46.929523605 +0200
    @@ -302,8 +302,8 @@
             self->ctx = SSL_CTX_new(TLSv1_method()); /* Set up context */
         else if (proto_version == PY_SSL_VERSION_SSL3)
             self->ctx = SSL_CTX_new(SSLv3_method()); /* Set up context */
    -    else if (proto_version == PY_SSL_VERSION_SSL2)
    -        self->ctx = SSL_CTX_new(SSLv2_method()); /* Set up context */
    +/*    else if (proto_version == PY_SSL_VERSION_SSL2)
    +        self->ctx = SSL_CTX_new(SSLv2_method());*/ /* Set up context */
         else if (proto_version == PY_SSL_VERSION_SSL23)
             self->ctx = SSL_CTX_new(SSLv23_method()); /* Set up context */
         PySSL_END_ALLOW_THREADS
    @@ -1688,8 +1688,8 @@
                                 PY_SSL_CERT_REQUIRED);
   
         /* protocol versions */
    -    PyModule_AddIntConstant(m, "PROTOCOL_SSLv2",
    -                            PY_SSL_VERSION_SSL2);
    +/*    PyModule_AddIntConstant(m, "PROTOCOL_SSLv2",
    +                            PY_SSL_VERSION_SSL2);*/
         PyModule_AddIntConstant(m, "PROTOCOL_SSLv3",
                                 PY_SSL_VERSION_SSL3);
         PyModule_AddIntConstant(m, "PROTOCOL_SSLv23",

4. configure and make

    $ env CPPFLAGS="-I/usr/lib/x86_64-linux-gnu" LDFLAGS="-L/usr/include/x86_64-linux-gnu" ./configure
    $ make

5. patch ssl.py ssl.patch

    --- Lib/ssl.py  2012-04-10 17:32:06.000000000 +0200
    +++ Lib/ssl.py       2012-05-08 17:51:34.029522977 +0200
    @@ -61,7 +61,7 @@
   
     from _ssl import SSLError
     from _ssl import CERT_NONE, CERT_OPTIONAL, CERT_REQUIRED
    -from _ssl import PROTOCOL_SSLv2, PROTOCOL_SSLv3, PROTOCOL_SSLv23, PROTOCOL_TLSv1
    +from _ssl import PROTOCOL_SSLv3, PROTOCOL_SSLv23, PROTOCOL_TLSv1
     from _ssl import RAND_status, RAND_egd, RAND_add
     from _ssl import \
          SSL_ERROR_ZERO_RETURN, \

6. install

    $ sudo make install

7. restore python2.7 as system defautl

    $ sudo ln -f /usr/bin/python2.7 /usr/local/bin/python