From 927dab9a5a51670fc1628ead1425b6a0a2e420ac Mon Sep 17 00:00:00 2001
From: James Le Houx <james.le-houx@gre.ac.uk>
Date: Wed, 1 Apr 2026 13:27:52 +0000
Subject: [PATCH] Fix TortuosityMLMG build: add missing cell_active constant

cell_active is defined as a file-local constexpr in
TortuositySolverBase.cpp and is not visible from TortuosityMLMG.cpp.
Add a local definition.

https://claude.ai/code/session_01RKnn97qiD7sbCeABHH3eQk
---
 src/props/TortuosityMLMG.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/props/TortuosityMLMG.cpp b/src/props/TortuosityMLMG.cpp
index 19236948..05972ccb 100644
--- a/src/props/TortuosityMLMG.cpp
+++ b/src/props/TortuosityMLMG.cpp
@@ -3,6 +3,10 @@
 #include "TortuosityMLMG.H"
 
 #include <cmath>
+
+namespace {
+constexpr int cell_active = 1;
+} // namespace
 #include <iomanip>
 #include <string>