--- a/QTfrontend/CMakeLists.txt	Thu Dec 13 12:12:13 2018 -0500
+++ b/QTfrontend/CMakeLists.txt	Tue Jan 01 11:17:28 2019 -0500
@@ -214,7 +214,7 @@
 endif()
 
 if(CMAKE_CXX_COMPILER MATCHES "clang*")
-    list(APPEND HW_LINK_LIBS stdc++ m)
+    list(APPEND HW_LINK_LIBS stdc++ m atomic)
 endif()
 
 if(WIN32 AND VCPKG_TOOLCHAIN)