A little has been done. Some important questions arised.
     1 CXXFLAGS = -Wall -ggdb --no-inline -I../../.. -I.. -I/usr/local/cplex/cplex75/include
 
     6 	rm lp_test lp_sample_cplex lp_sample *.o
 
     8 lp_base.o: ../../../lemon/lp_base.cc ../../../lemon/lp_base.h 
 
     9 	$(CXX) $(CXXFLAGS) -o $@ -c $<
 
    12 lp_solver_skeleton.o: lp_solver_skeleton.cc lp_solver_skeleton.h lp_base.h 
 
    13 	$(CXX) $(CXXFLAGS) -o $@ -c $<
 
    15 lp_glpk.o: ../../../lemon/lp_glpk.cc ../../../lemon/lp_glpk.h ../../../lemon/lp_base.h
 
    16 	$(CXX) $(CXXFLAGS) -o $@ -c $<
 
    18 lp_cplex.o: lp_cplex.cc lp_cplex.h ../../../lemon/lp_base.h
 
    19 	$(CXX) $(CXXFLAGS) -I/usr/local/cplex/cplex75/include -o $@ -c $<
 
    21 lp_sample.o: lp_sample.cc
 
    23 lp_sample: lp_sample.o lp_base.o lp_glpk.o 
 
    24 	$(CXX) -o $@ $^ -lglpk
 
    26 lp_sample_cplex: lp_sample_cplex.o lp_base.o lp_cplex.o 
 
    27 	$(CXX) $(CXXFLAGS)  -o $@ $^ -L/usr/local/cplex/cplex75/lib/i86_linux2_glibc2.2_gcc3.0/static_pic_mt -lcplex -lm -lpthread
 
    29 #	$(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $^