From 103f2ce813e462968fe0d6a2e5ec779a0738821e Mon Sep 17 00:00:00 2001
From: Christian Semmler <mail@csemmler.com>
Date: Sun, 5 Apr 2026 08:22:24 -0700
Subject: [PATCH] Fix Docker build failure due to missing .git directory

Only add .git/HEAD as a build dependency when it exists, so the
Emscripten build succeeds in environments without a .git directory
(e.g. Docker).
---
 CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index be7cc420..f3f6dbd7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,8 +22,9 @@ if (EMSCRIPTEN)
   # Resolve git HEAD to find file dependencies for change detection.
   # .git/HEAD changes on branch switch; the ref file it points to changes on commit.
   set(_git_head "${CMAKE_SOURCE_DIR}/.git/HEAD")
-  set(_git_deps "${_git_head}")
+  set(_git_deps)
   if(EXISTS "${_git_head}")
+    list(APPEND _git_deps "${_git_head}")
     file(READ "${_git_head}" _head_ref)
     string(STRIP "${_head_ref}" _head_ref)
     if(_head_ref MATCHES "^ref: (.+)$")