--- src/util/CMakeLists.txt.orig	2024-03-22 17:20:53 UTC
+++ src/util/CMakeLists.txt
@@ -21,6 +21,10 @@ INCLUDE_DIRECTORIES(
     ${PCGCPP_INCLUDE_DIR}
     )
 
+set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
+set(THREADS_PREFER_PTHREAD_FLAG TRUE)
+find_package(Threads REQUIRED)
+
 ADD_LIBRARY(util
 BndBox.cpp
 CADutil.cpp
@@ -82,3 +86,5 @@ XferSurf.h
 WriteMatlab.h
 XferSurf.h
 )
+
+target_link_libraries(util Threads::Threads)