From d852a34ef70723f314c32dd7554967a175db75ba Mon Sep 17 00:00:00 2001
From: Steve Lhomme <slhomme@matroska.org>
Date: Wed, 1 Jan 2025 13:00:46 +0100
Subject: [PATCH] CMake: use the system bzip2 if it exists

It's found on macOS and sometimes Linux.
---
 libmatroska2/CMakeLists.txt | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/libmatroska2/CMakeLists.txt b/libmatroska2/CMakeLists.txt
index 68747ab8..4eb705cc 100644
--- a/libmatroska2/CMakeLists.txt
+++ b/libmatroska2/CMakeLists.txt
@@ -58,14 +58,23 @@ if (CONFIG_ZLIB)
     target_link_libraries("matroska2" PRIVATE $<BUILD_INTERFACE:zlibstatic>)
   endif()
 endif(CONFIG_ZLIB)
+
 if (CONFIG_LZO1X)
   add_subdirectory("minilzo")
   target_link_libraries("matroska2" PRIVATE $<BUILD_INTERFACE:minilzo>)
 endif(CONFIG_LZO1X)
+
 if (CONFIG_BZLIB)
-  add_subdirectory("bzip2")
-  target_link_libraries("matroska2" PRIVATE $<BUILD_INTERFACE:bzlib>)
+  find_package (BZip2)
+  if(BZIP2_FOUND)
+    target_include_directories("matroska2" PRIVATE ${BZIP2_INCLUDE_DIRS})
+    target_link_libraries("matroska2" PRIVATE ${BZIP2_LIBRARIES})
+  else()
+    add_subdirectory("bzip2")
+    target_link_libraries("matroska2" PRIVATE $<BUILD_INTERFACE:bzlib>)
+  endif()
 endif(CONFIG_BZLIB)
+
 if (NOT CONFIG_NOCODEC_HELPER)
   add_subdirectory("tremor")
   target_link_libraries("matroska2" PRIVATE $<BUILD_INTERFACE:tremor>)