makefile should now be very neutral and does not even specify a C compiler.

Makefile

@@ -9,6 +9,6 @@ md: $(OBJS) $(INCS)
 	$(CC) $(CFLAGS) rvec.o md.o md-extra.o -o md -lm
 
 clean:
-	rm -f md
+	rm -f md a.out
 	rm -f *.o
 	rm -f *~

README.md

 # MD Uebung files
 
 This began life as Nils Uebung.
-In June 2022, I had to move executable code out of `rvec.h`. There was executable code which is not allowed in a `.h` file.
+In June 2022, I moved executable code out of `rvec.h`. There was executable code which is not allowed in a `.h` file.
 
 I also removed some unnecessary lines from the Makefile.
+
+# BUGS
+If you compile with `-Wall`, there will be some warnings about unused variables. These are not a problem. This is an assignment in which one should write code that uses these variables.