[CMake] cmake my_BouncyBall

[luxInteg]

Greetings,

I am learning cmake. and I have taken the following from an old Makefile:-
INC = ../include/BouncyBall.h 

BouncyBall: BouncyBall.c library $(INC)
	${CC} ${CFLAGS}  -o BouncyBall BouncyBall.c ../lib/libOLD.a 
	./BouncyBall > my_BouncyBall.out  - diff BouncyBall.out my_BouncyBall.out

and  'translated'   for cmake  as the following:-
-----------------------
add_executable(BouncyBall BouncyBall.c)
find_library(OLD_LIBRARY OLD)
target_link_libraries(BouncyBall ${OLD_LIBRARY})
COMMAND(./BouncyBall > my_BouncyBall.out
	- diff BouncyBall.out my_BouncyBall.out)
install(TARGETS 
BouncyBall
BouncyBall.out 
my_BouncyBall.out
 DESTINATION bin)
-----------------------
but it does not work

advice would be appreciated

sincerely
luxInteg