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gh-95957: Add instructions for Tcl/Tk and OpenSSL on RHEL/CentOS 7 (#95964) 

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>
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Christian Heimes 2022-08-16 13:44:02 +02:00 committed by GitHub
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Doc/whatsnew/3.11.rst
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* Build dependencies, compiler flags, and linker flags for most stdlib
extension modules are now detected by :program:`configure`. libffi, libnsl,
libsqlite3, zlib, bzip2, liblzma, libcrypt, Tcl/Tk libs, and uuid flags
are detected by ``pkg-config`` (when available).
libsqlite3, zlib, bzip2, liblzma, libcrypt, Tcl/Tk, and uuid flags
are detected by ``pkg-config`` (when available). :mod:`tkinter` now
requires ``pkg-config`` command to detect development settings for Tcl/Tk
headers and libraries.
(Contributed by Christian Heimes and Erlend Egeberg Aasland in
:issue:`45847`, :issue:`45747`, and :issue:`45763`.)
.. note::
Use the environment variables ``TCLTK_CFLAGS`` and ``TCLTK_LIBS`` to
manually specify the location of Tcl/Tk headers and libraries.
The :program:`configure` options ``--with-tcltk-includes`` and
``--with-tcltk-libs`` have been removed.
Use the environment variables :envvar:`TCLTK_CFLAGS` and
:envvar:`TCLTK_LIBS` to manually specify the location of Tcl/Tk headers
and libraries. The :program:`configure` options ``--with-tcltk-includes``
and ``--with-tcltk-libs`` have been removed.
On RHEL 7 and CentOS 7 the development packages do not provide ``tcl.pc``
and ``tk.pc``, use :envvar:`TCLTK_LIBS="-ltk8.5 -ltkstub8.5 -ltcl8.5"`.
The directory ``Misc/rhel7`` contains ``.pc`` files and instructions
how to build Python with RHEL 7's and CentOS 7's Tcl/Tk and OpenSSL.
* CPython now has :pep:`11` tier 3 support for cross compiling to WebAssembly
platform ``wasm32-unknown-emscripten`` (Python in the browser). The effort

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What's New 3.11 now has instructions for how to provide compiler and
linker flags for Tcl/Tk and OpenSSL on RHEL 7 and CentOS 7.

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# pkg-config overrides for RHEL 7 and CentOS 7
RHEL 7 and CentOS 7 do not provide pkg-config `.pc` files for Tcl/Tk. The
OpenSSL 1.1.1 pkg-config file is named `openssl11.pc` and not picked up
by Python's `configure` script.
To build Python with system Tcl/Tk libs and OpenSSL 1.1 package, first
install the developer packages and the `pkgconfig` package with `pkg-config`
command.
```shell
sudo yum install pkgconfig 'tcl-devel >= 8.5.12' 'tk-devel >= 8.5.12' openssl11-devel
```
The run `configure` with `PKG_CONFIG_PATH` environment variable.
```shell
PKG_CONFIG_PATH=Misc/rhel7 ./configure -C
```

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Name: OpenSSL
Version: 1.1.1k
Requires: libssl11 libcrypto11

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Name: Tool Command Language
Version: 8.5.12
Libs: -ltcl8.5 -ltclstub8.5
# Libs.private: -ldl -lz -lpthread -lm

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Name: The Tk Toolkit
Version: 8.5.12
Requires: tcl >= 8.5.12
Libs: -ltk8.5 -ltkstub8.5
# Libs.private: -lXft -lfontconfig -lfreetype -lfontconfig -lX11