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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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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Misc/rhel7/openssl.pc Normal file
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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