Added zlib

docs/CHANGELOG.md

@@ -2,6 +2,29 @@
 
 ---
 
+## V43 2026-03-21 01:15:00
+
+**Add zlib build to chroot phase — ld needs libz.so.1 at runtime**
+
+### Changes:
+- Added `024a-zlib.sh`: Builds zlib as the first package in the chroot. The linker
+  (`ld`) from binutils pass 2 was compiled with zlib support and dynamically links
+  against `libz.so.1`. Without it, every link attempt fails with "error while loading
+  shared libraries: libz.so.1: cannot open shared object file". This was the actual
+  root cause of "C compiler cannot create executables" — not a missing ld symlink
+  (though that was also needed and fixed in V42).
+- Updated `023a-chroot-build-all.sh`: Added `024a-zlib.sh` between 024 and 025.
+- Simplified `024-chroot-essentials.sh`: Replaced verbose gcc diagnostic with a
+  simple presence check + note that zlib must be built first.
+
+### Plan deviation/changes:
+- None
+
+### What is missing/needs polish:
+- None
+
+---
+
 ## V42 2026-03-21 01:00:00
 
 **Fix chroot gcc linker failure — create cross-prefix symlinks for ld**