--- a/makefile
+++ b/makefile
@@ -6,21 +6,21 @@
 #CC = /bin/cc
 
 # Location of gnu c++ library.  
-#LIBDIR = /usr/lib 
-LIBDIR = /usr/local/lib 
+LIBDIR = /usr/lib 
+#LIBDIR = /usr/local/lib 
 
 # Location of gnu gmp library libgmp.a  
-#GMPLIBDIR = /usr/lib 
-GMPLIBDIR = /usr/local/lib 
+GMPLIBDIR = /usr/lib 
+#GMPLIBDIR = /usr/local/lib 
 
 # Location of gnu gmp-library include file gmp.h 
-#GMPINCLUDEDIR = /usr/include
-GMPINCLUDEDIR = /usr/local/include
+GMPINCLUDEDIR = /usr/include
+#GMPINCLUDEDIR = /usr/local/include
 
 # Compiler optimization/debug options
 #OPTFLAGS = -g -static -O
 #OPTFLAGS = -g -static -pg -O
-OPTFLAGS = -O3
+#OPTFLAGS = -O3
 
 ########## You shouldn't have to change anything after this point ##########
 
@@ -29,9 +29,8 @@
 RATOBJ = gmp_init.o Integer.o Rational.o
 RATEXE = cddr+
 
-CFLAGS = $(OPTFLAGS) -I$(INCLUDEDIR) -I$(GMPINCLUDEDIR) -I. $(GMPFLAG)
-
-LDFLAGS = -L$(LIBDIR) -L$(GMPLIBDIR)
+CFLAGS += -I$(INCLUDEDIR) -I$(GMPINCLUDEDIR) -I. $(GMPFLAG)
+LDFLAGS += -L$(LIBDIR) -L$(GMPLIBDIR) 
 
 LIBS = -lstdc++ -l$(RATLIB)