From 5cc224cb3ede8c3ab8e4038eb2f2a05b4a98cc5d Mon Sep 17 00:00:00 2001
From: blueloveTH <blueloveth@foxmail.com>
Date: Fri, 8 Nov 2024 18:07:48 +0800
Subject: [PATCH] ...

---
 CMakeLists.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cf2e294a..02ce7339 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -82,4 +82,12 @@ if(UNIX)
     if(PK_ENABLE_OS)
         target_link_libraries(${PROJECT_NAME} dl)
     endif()
+
+    # for very old linux systems
+    include(CheckLibraryExists)
+    check_library_exists(rt clock_gettime "" HAVE_LIBRT)
+
+    if(HAVE_LIBRT)
+        target_link_libraries(${PROJECT_NAME} rt)
+    endif()
 endif()