diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -68,6 +68,7 @@
 TARGET += compliteral
 TARGET += getbits
 TARGET += fun
+TARGET += sts
 
 # needs ncursesw
 TARGET  += ncurses
@@ -356,6 +357,10 @@
 	@echo Linking $<...
 	@$(CC) -Wall -O2 -g -ggdb $(LDFLAGS) $< -o $@
 
+sts: sts.o
+	@echo Linking $<...
+	@$(CC) -Wall -O2 -lm -g -ggdb $(LDFLAGS) $< -o $@
+
 .PHONY: beauty clean uninstall
 
 clean: