Patch-Source: https://github.com/archlinux/svntogit-community/blob/300f36460d1b94f4378d7676dc420dfe7d78959f/trunk/ppsspp-system-zstd.patch
diff '--color=auto' -rupN libretro-ppsspp.orig/CMakeLists.txt libretro-ppsspp/CMakeLists.txt
--- libretro-ppsspp.orig/CMakeLists.txt	2021-10-01 17:28:30.046655852 +0200
+++ libretro-ppsspp/CMakeLists.txt	2021-10-01 17:30:38.698699237 +0200
@@ -151,6 +151,7 @@ option(USE_MINIUPNPC "Build with miniUPn
 option(USE_SYSTEM_SNAPPY "Dynamically link against system snappy" ${USE_SYSTEM_SNAPPY})
 option(USE_SYSTEM_FFMPEG "Dynamically link against system FFMPEG" ${USE_SYSTEM_FFMPEG})
 option(USE_SYSTEM_LIBZIP "Dynamically link against system libzip" ${USE_SYSTEM_LIBZIP})
+option(USE_SYSTEM_ZSTD "Dynamically link against system zstd" ${USE_SYSTEM_ZSTD})
 option(USE_SYSTEM_LIBSDL2 "Dynamically link against system SDL2" ON)
 option(USE_SYSTEM_LIBPNG "Dynamically link against system libpng" ON)
 option(USE_ASAN "Use address sanitizer" OFF)
@@ -1976,8 +1977,20 @@ if(ANDROID)
 	endif()
 endif()
 
-set(CoreExtraLibs ${CoreExtraLibs} armips libzstd_static)
-include_directories(ext/zstd/lib)
+set(CoreExtraLibs ${CoreExtraLibs} armips)
+
+find_package(PkgConfig)
+if(PKG_CONFIG_FOUND)
+	pkg_check_modules(ZSTD libzstd)
+endif()
+if(ZSTD_FOUND AND USE_SYSTEM_ZSTD)
+	include_directories(${ZSTD_INCLUDE_DIRS})
+	target_link_libraries(${CoreLibName} ${ZSTD_LIBRARIES})
+else()
+	add_subdirectory(ext/zstd/build/cmake EXCLUDE_FROM_ALL)
+	include_directories(ext/zstd/lib)
+	set(CoreExtraLibs ${CoreExtraLibs} libzstd_static)
+endif()
 
 # needed for VK_USE_PLATFORM_XCB_KHR only
 #if(VULKAN AND NOT WIN32)
diff '--color=auto' -rupN libretro-ppsspp.orig/ext/CMakeLists.txt libretro-ppsspp/ext/CMakeLists.txt
--- libretro-ppsspp.orig/ext/CMakeLists.txt	2021-10-01 17:28:30.136664237 +0200
+++ libretro-ppsspp/ext/CMakeLists.txt	2021-10-01 17:30:45.282654341 +0200
@@ -22,4 +22,3 @@ add_subdirectory(SPIRV-Cross-build)
 if(USE_DISCORD AND NOT IOS AND NOT LIBRETRO)
 	add_subdirectory(discord-rpc-build)
 endif()
-add_subdirectory(zstd/build/cmake EXCLUDE_FROM_ALL)