From a80e1a578f36206dc21be09ab93a93830f7a122b Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Tue, 19 Dec 2023 08:04:35 -0500
Subject: Add notes about zlib-ng

---
 TODO.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/TODO.md b/TODO.md
index 5272a591..d8266f16 100644
--- a/TODO.md
+++ b/TODO.md
@@ -18,6 +18,27 @@ Contents
 
 - [HISTORICAL NOTES](#historical-notes)
 
+zlib-ng
+=======
+
+* Write ZLIB COMPATIBILITY section of README-maintainer.md.
+* Note: deterministic IDs are affected by choice of zlib
+
+```
+cd /tmp
+git clone https://github.com/zlib-ng/zlib-ng
+cd zlib-ng
+cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/tmp/inst -DZLIB_COMPAT=ON
+cmake --build build -j $(nproc)
+(cd build; ctest --verbose)
+cmake --install build
+```
+
+Then run qpdf's test suite with
+```
+LD_PRELOAD=/tmp/inst/lib/libz.so.1 ctest --verbose
+```
+
 Always
 ======
 
-- 
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