This is what to start with 
fork/exec /Users/svteacher/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2/bin/avr-g++: no such file or directory
Re-install might indeed be in place.
This is what to start with
fork/exec /Users/svteacher/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2/bin/avr-g++: no such file or directory
Re-install might indeed be in place.