From ce0b60eb32c9ec71d3ab1f55156535a73aa6426d Mon Sep 17 00:00:00 2001
From: Oliver Lantwin <oliver.lantwin@cern.ch>
Date: Fri, 13 Mar 2026 09:43:53 +0100
Subject: [PATCH] fix: only require CMake 3.20.0

---
 CHANGELOG.md | 3 ++-
 cmake.sh     | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b3a89c8d..ecab76f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,7 +19,8 @@ Until May 2022 (inclusive) no changelog was kept. We might try to reconstruct it
 
 ### Changed
 
-* CMake: Update to v4.2.3
+* CMake: Update to v4.2.3, but only require v3.20.0 from system (FairShip
+  minimum)
 * python: Require at least 3.12.12 in prefer_system_check
 * ROOT: Update to 6.36.08
 * defaults-actstracking: Removed all overrides unrelated to ACTS or C++20.
diff --git a/cmake.sh b/cmake.sh
index 95fa2e12..18b81a13 100644
--- a/cmake.sh
+++ b/cmake.sh
@@ -6,7 +6,7 @@ build_requires:
   - "GCC-Toolchain:(?!osx)"
 prefer_system: .*
 prefer_system_check: |
-    REQUESTED_VERSION=${REQUESTED_VERSION#v}
+    REQUESTED_VERSION=3.20.0
     verge() { [[  "$1" = "`echo -e "$1\n$2" | sort -V | head -n1`" ]]; }
     type cmake && verge $REQUESTED_VERSION `cmake --version | sed -e 's/.* //' | cut -d. -f1,2,3`
 ---