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

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>

1 files changed, 13 insertions, 6 deletions

diff --git a/Doc/whatsnew/3.11.rst b/Doc/whatsnew/3.11.rst
index f1f0230..ef84339 100644
--- a/Doc/whatsnew/3.11.rst
+++ b/Doc/whatsnew/3.11.rst
@@ -1644,16 +1644,23 @@ Build Changes
 
 * 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