gh-135504: Document `LIBZSTD_CFLAGS` and `LIBZSTD_LIBS` config options (#135505)

diff --git a/Doc/using/configure.rst b/Doc/using/configure.rst
index b914d3397b6dda42eaed0dbbb6047cdb77b1e4f8..0b7eaf35a1e689f43173a34267d9212757254223 100644 (file)
--- a/Doc/using/configure.rst
+++ b/Doc/using/configure.rst
@@ -445,6 +445,14 @@ Options for third-party dependencies
    C compiler and linker flags for ``libuuid``, used by :mod:`uuid` module,
    overriding ``pkg-config``.
 
+.. option:: LIBZSTD_CFLAGS
+.. option:: LIBZSTD_LIBS
+
+   C compiler and linker flags for ``libzstd``, used by :mod:`compression.zstd` module,
+   overriding ``pkg-config``.
+
+   .. versionadded:: 3.14
+
 .. option:: PANEL_CFLAGS
 .. option:: PANEL_LIBS