makefile - two executables

CCC = g++  
EXEC1 = HEncode
EXEC2 = HDecode
OBJ1  = main.o HEncode.o Tree.o Node.o
OBJ2  = main.o HDecode.o Tree.o Node.o

all:      $(EXEC1) $(EXEC2)

$(EXEC1): $(OBJ1)
	$(CCC) $(OBJ1) -o $(EXEC1)

$(EXEC2): $(OBJ2)
	$(CCC) $(OBJ2) -o $(EXEC2)

main.o: main.cc
HEncode.o: HEncode.cc HEncode.h
HDecode.o: HDecode.cc HDecode.h
Tree.o: Tree.cc Tree.h
Node.o: Node.cc Node.h

g++   main.o HEncode.o Tree.o Node.o -o HEncode
Undefined                       first referenced
 symbol                             in file
HDecode::decode(void)               main.o
HDecode::~HDecode(void)             main.o
HDecode::HDecode(basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0> >)main.o
ld: fatal: Symbol referencing errors. No output written to HEncode
collect2: ld returned 1 exit status
make: *** [HEncode] Error 1

g++    -c -o HDecode.o HDecode.cc
g++   main.o HDecode.o Tree.o Node.o -o HDecode
Undefined                       first referenced
 symbol                             in file
HEncode::encode(void)               main.o
HEncode::~HEncode(void)             main.o
HEncode::HEncode(basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0> >)main.o
ld: fatal: Symbol referencing errors. No output written to HDecode
collect2: ld returned 1 exit status
make: *** [HDecode] Error 1