Cannot compile and link AVR program in OS X

I am working on a mac with Yosemite OS X and I'm trying to compile a program in C that I could then upload onto my Arduino. I am following this tutorial specifically. I tried going through and reinstalling avr-gcc, but I got the same output. I tried searching for the file crtatmega328p.o on my system but it is nowhere to be found and the same goes for the directory. Any help would be appreciated.

$ avr-gcc -Os -DF_CPU=16000000UL -mmcu=atmega328p -c -o Program.o Program.c

$ avr-gcc -mmcu=atmega328p Program.o -o Program

/usr/local/lib/gcc/avr/5.2.0/../../../../avr/bin/ld: cannot find crtatmega328p.o: No such file or directory

/usr/local/lib/gcc/avr/5.2.0/../../../../avr/bin/ld: cannot find -latmega328p collect2: error: ld returned 1 exit status