From 336319966b484889bbdd1da58623293b93980628 Mon Sep 17 00:00:00 2001
From: Marc Fehling <marc.fehling@gmx.net>
Date: Sun, 1 Dec 2019 00:51:16 +0100
Subject: [PATCH] Fixed cmake 3.16.0 incompatibility.

---
 cmake/configure/configure_1_threads.cmake | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/cmake/configure/configure_1_threads.cmake b/cmake/configure/configure_1_threads.cmake
index b4de2cc2cc..b039497a13 100644
--- a/cmake/configure/configure_1_threads.cmake
+++ b/cmake/configure/configure_1_threads.cmake
@@ -38,6 +38,16 @@ MACRO(SETUP_THREADING)
 
     RESET_CMAKE_REQUIRED()
 
+    #
+    # The FindThreads macro returned a linker option instead of the actual
+    # library name in earlier versions. We still require the linker option,
+    # so we fix the corresponding variable.
+    #  - See: https://gitlab.kitware.com/cmake/cmake/issues/19747
+    #
+    IF(CMAKE_THREAD_LIBS_INIT AND NOT "${CMAKE_THREAD_LIBS_INIT}" MATCHES "^-l")
+      STRING(PREPEND CMAKE_THREAD_LIBS_INIT "-l")
+    ENDIF()
+
   ELSE()
 
     #
-- 
2.39.5