--- CMakeLists.txt.orig	2021-07-21 06:15:34 UTC
+++ CMakeLists.txt
@@ -233,6 +233,12 @@ if(ENABLE_CURL)
     endif()
 endif()
 
+find_package(Threads)
+set(gmic_qt_LIBRARIES
+    ${gmic_qt_LIBRARIES}
+    Threads::Threads
+)
+
 add_definitions(-Dgmic_build)
 add_definitions(-Dcimg_use_abort)
 add_definitions(-Dgmic_is_parallel)
