+CXXFLAGS += -O3
+
+ifeq ($(strip $(64BIT_VERSION)),yes)
+ #if you are using centos uncomment the following lines
+ #CXX = g++44
+
+ #if you are a mac user use the following line
+ TARGET_ARCH += -arch x86_64
+
+ #if you using cygwin to build Windows the following line
+ #CXX = x86_64-w64-mingw32-g++
+ #CC = x86_64-w64-mingw32-g++
+ #FORTAN_COMPILER = x86_64-w64-mingw32-gfortran
+ #TARGET_ARCH += -m64 -static
+
+ #if you are a linux user use the following line
+ #CXXFLAGS += -mtune=native -march=native -m64
+
+ CXXFLAGS += -DBIT_VERSION
+ FORTRAN_FLAGS = -m64
+endif
+