Makefile error while setting up boost library in xcode
===

This is the code in my makefile:

    #makefile for the boost project
    #You must modify the environment variables at the start of the file
    #in order to work!
    #example: Consider the 1_34_1 boost distribution, which installs all the
    #stuff by default in usr/local/lib (for the libraries) and in
    #usr/local/boost_1_34_1/boost (for the headers to be included).
    # The following setup is for loading the libraries from this location. 
    #If you want to load them from a custom location, modify the variables 
    #below accordingly.
    
    BOOST_ROOT=/usr/local
    PRODUCT_NAME=example
    BOOST_INCLUDE_DIR=$(BOOST_ROOT)/include/boost_1_34_1
    BOOST_LIB_DIR=$(BOOST_ROOT)/lib
       main: main.cpp 
       g++ main.cpp -I$(BOOST_INCLUDE_DIR) -L$(BOOST_LIB_DIR) -o $(PRODUCT_NAME)
    clean:
           rm -f main

I know there are other options with using boost, but please just fix it so this error doesnt occur:

*** missing separator. Stop