From 115d3f883e2fceea0f2e7df0e570864a01178f4e Mon Sep 17 00:00:00 2001
From: Pierre Ossman <ossman@cendio.se>
Date: Sat, 4 Jun 2022 14:19:07 +0200
Subject: [PATCH] Add target_link_directory() compat function

We need this function to deal with pkgconfig files properly, but
unfortunately it doesn't exist until CMake 3.13, and we need to support
CMake 3.10. So add a hacky compatibility function for older systems.
---
 CMakeLists.txt                    |  2 ++
 cmake/TargetLinkDirectories.cmake | 12 ++++++++++++
 2 files changed, 14 insertions(+)
 create mode 100644 cmake/TargetLinkDirectories.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1c6b99fd61..f8cacb9dd7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,6 +17,8 @@ include(CheckCSourceRuns)
 
 include(CMakeMacroLibtoolFile)
 
+include(cmake/TargetLinkDirectories.cmake)
+
 project(tigervnc)
 set(VERSION 1.12.80)
 
diff --git a/cmake/TargetLinkDirectories.cmake b/cmake/TargetLinkDirectories.cmake
new file mode 100644
index 0000000000..11b056702e
--- /dev/null
+++ b/cmake/TargetLinkDirectories.cmake
@@ -0,0 +1,12 @@
+# Compatibility replacement of target_link_directories() for older cmake
+
+if(${CMAKE_VERSION} VERSION_LESS "3.13.0")
+  function(target_link_directories TARGET SCOPE)
+    get_target_property(INTERFACE_LINK_LIBRARIES ${TARGET} INTERFACE_LINK_LIBRARIES)
+    foreach(DIRECTORY ${ARGN})
+      list(INSERT INTERFACE_LINK_LIBRARIES 0 "-L${DIRECTORY}")
+    endforeach()
+    set_target_properties(${TARGET} PROPERTIES
+      INTERFACE_LINK_LIBRARIES "${INTERFACE_LINK_LIBRARIES}")
+  endfunction()
+endif()