From f10ff734362d5841d860905900e549f2c51153c0 Mon Sep 17 00:00:00 2001
From: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
Date: Fri, 5 Jun 2026 15:46:37 +0100
Subject: [PATCH] cmake: Skip `PATH` environment variable when discovering
 CapnProto

On systems with UsrMerge, the `PATH` environment variable can cause
CMake to produce include paths that contain root-level symlinks. The
`capnp` compiler resolves paths lexically and fails to process them
properly, resulting in a "no such directory" error.
---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 29678efb..872bcd14 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,7 +13,7 @@ endif()
 include("cmake/compat_find.cmake")
 
 find_package(Threads REQUIRED)
-find_package(CapnProto 0.7 QUIET NO_MODULE)
+find_package(CapnProto 0.7 QUIET NO_MODULE NO_SYSTEM_ENVIRONMENT_PATH)
  if(NOT CapnProto_FOUND)
    message(FATAL_ERROR
      "Cap'n Proto is required but was not found.\n"