From 1922943a17ca4fbfcbf78c2997433e9708773bb7 Mon Sep 17 00:00:00 2001
From: Caleb Xu <calebcenter@live.com>
Date: Sat, 3 May 2025 22:48:43 -0400
Subject: [PATCH] cmake: allow using system-installed readerwriterqueue

---
 cmake/libremidi.deps.cmake | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/cmake/libremidi.deps.cmake b/cmake/libremidi.deps.cmake
index f2089c0d..fe488e79 100644
--- a/cmake/libremidi.deps.cmake
+++ b/cmake/libremidi.deps.cmake
@@ -40,11 +40,15 @@ if(NOT LIBREMIDI_NO_PIPEWIRE)
   set(LIBREMIDI_NEEDS_READERWRITERQUEUE 1)
 endif()
 if(LIBREMIDI_NEEDS_READERWRITERQUEUE AND NOT TARGET readerwriterqueue)
-  FetchContent_Declare(
-      readerwriterqueue
-      GIT_REPOSITORY https://github.com/cameron314/readerwriterqueue
-      GIT_TAG        master
-  )
+  find_package(readerwriterqueue)
+
+  if(NOT readerwriterqueue_FOUND)
+    FetchContent_Declare(
+        readerwriterqueue
+        GIT_REPOSITORY https://github.com/cameron314/readerwriterqueue
+        GIT_TAG        master
+    )
 
-  FetchContent_MakeAvailable(readerwriterqueue)
+    FetchContent_MakeAvailable(readerwriterqueue)
+  endif()
 endif()