From 9e29b76fbc719ba9fca86270b906bf9f249b8f4d Mon Sep 17 00:00:00 2001
From: forbes <zoe.forbes@kindred-systems.com>
Date: Fri, 6 Feb 2026 16:48:03 -0600
Subject: [PATCH] fix(build): pin icu >=75,<76 to prevent header/lib version
 mismatch

The build environment resolved ICU 78 headers while the host environment
had ICU 75 libraries (constrained by xerces-c, qt6-main, etc.). This
caused libFreeCADBase.so to contain icu_78 mangled symbols that couldn't
be found in the bundled ICU 75 libs at runtime:

  undefined symbol: _ZN6icu_7813UnicodeString8fromUTF8ENS_11StringPieceE

Pin ICU explicitly in both recipe.yaml host deps and pixi.toml to ensure
headers and libs always match.
---
 package/rattler-build/recipe.yaml | 1 +
 pixi.toml                         | 1 +
 2 files changed, 2 insertions(+)

diff --git a/package/rattler-build/recipe.yaml b/package/rattler-build/recipe.yaml
index 6b52b6807f..00588983ce 100644
--- a/package/rattler-build/recipe.yaml
+++ b/package/rattler-build/recipe.yaml
@@ -102,6 +102,7 @@ requirements:
     - fmt
     - freetype
     - hdf5
+    - icu>=75,<76
     - lark
     - libboost-devel
     - matplotlib-base
diff --git a/pixi.toml b/pixi.toml
index 9bc5a7bdd5..5d33ffc770 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -25,6 +25,7 @@ freetype = "*"
 git = "*"
 graphviz = "*"
 hdf5 = "*"
+icu = ">=75,<76"
 ifcopenshell = "*"
 lark = "*"
 libboost-devel = "*"