--- a/src/Makevars.in	2023-05-14 04:29:12.000000000 +0800
+++ b/src/Makevars.in	2023-05-18 15:23:10.000000000 +0800
@@ -1,5 +1,5 @@
 PKG_CPPFLAGS = -I../src -DSTRICT_R_HEADERS
-PKG_LIBS = @libs@
+PKG_LIBS = @libs@ -latomic
 PKG_CXXFLAGS = @cflags@ -pthread
 
 CXX_STD = CXX11