user46762: private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/arduino-builder -dump-prefs -logger=machine -hardware /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/hardware -hardware /Users/daniellecomte/Library/Arduino15/packages -tools /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/tools-builder -tools /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/hardware/tools/avr -tools /Users/daniellecomte/Library/Arduino15/packages -built-in-libraries /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/libraries -libraries /Users/daniellecomte/Documents/Arduino/libraries -fqbn=arduino:avr:mega:cpu=atmega2560 -vid-pid=0X2341_0X0042 -ide-version=10805 -build-path /var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/arduino_build_880660 -warnings=all -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/arduinoOTA/1.1.1 -prefs=runtime.tools.avrdude.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9 -prefs=runtime.tools.avr-gcc.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2 -verbose /var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/untitled1415726107.tmp/sketch_may19a/sketch_may19a.ino
/private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/arduino-builder -compile -logger=machine -hardware /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/hardware -hardware /Users/daniellecomte/Library/Arduino15/packages -tools /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/tools-builder -tools /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/hardware/tools/avr -tools /Users/daniellecomte/Library/Arduino15/packages -built-in-libraries /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/libraries -libraries /Users/daniellecomte/Documents/Arduino/libraries -fqbn=arduino:avr:mega:cpu=atmega2560 -vid-pid=0X2341_0X0042 -ide-version=10805 -build-path /var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/arduino_build_880660 -warnings=all -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/arduinoOTA/1.1.1 -prefs=runtime.tools.avrdude.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9 -prefs=runtime.tools.avr-gcc.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2 -verbose /var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/untitled1415726107.tmp/sketch_may19a/sketch_may19a.ino
Using board 'mega' from platform in folder: /Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21
Using core 'arduino' from platform in folder: /Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21
Detecting libraries used...
"/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR   "-I/Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21/cores/arduino" "-I/Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21/variants/mega" "/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/arduino_build_880660/sketch/sketch_may19a.ino.cpp" -o "/dev/null"
Generating function prototypes...
"/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR   "-I/Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21/cores/arduino" "-I/Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21/variants/mega" "/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/arduino_build_880660/sketch/sketch_may19a.ino.cpp" -o "/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/arduino_build_880660/preproc/ctags_target_for_gcc_minus_e.cpp"
fork/exec /Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2/bin/avr-g++: no such file or directory
Error compiling for board Arduino/Genuino Mega or Mega 2560.


user10794: 
avr-g++: no such file or directory

Try downloading the IDE again. It looks like it has lost sight of where the compiler is. Preferably not a nightly build but one of the stable versions.

46762: <pre><code>private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/arduino-builder -dump-prefs -logger=machine -hardware /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/hardware -hardware /Users/daniellecomte/Library/Arduino15/packages -tools /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/tools-builder -tools /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/hardware/tools/avr -tools /Users/daniellecomte/Library/Arduino15/packages -built-in-libraries /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/libraries -libraries /Users/daniellecomte/Documents/Arduino/libraries -fqbn=arduino:avr:mega:cpu=atmega2560 -vid-pid=0X2341_0X0042 -ide-version=10805 -build-path /var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/arduino_build_880660 -warnings=all -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/arduinoOTA/1.1.1 -prefs=runtime.tools.avrdude.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9 -prefs=runtime.tools.avr-gcc.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2 -verbose /var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/untitled1415726107.tmp/sketch_may19a/sketch_may19a.ino
/private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/arduino-builder -compile -logger=machine -hardware /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/hardware -hardware /Users/daniellecomte/Library/Arduino15/packages -tools /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/tools-builder -tools /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/hardware/tools/avr -tools /Users/daniellecomte/Library/Arduino15/packages -built-in-libraries /private/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/AppTranslocation/8AC1112E-019A-430D-A268-5BEDD561B4FC/d/Arduino.app/Contents/Java/libraries -libraries /Users/daniellecomte/Documents/Arduino/libraries -fqbn=arduino:avr:mega:cpu=atmega2560 -vid-pid=0X2341_0X0042 -ide-version=10805 -build-path /var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/arduino_build_880660 -warnings=all -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/arduinoOTA/1.1.1 -prefs=runtime.tools.avrdude.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9 -prefs=runtime.tools.avr-gcc.path=/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2 -verbose /var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/untitled1415726107.tmp/sketch_may19a/sketch_may19a.ino
Using board 'mega' from platform in folder: /Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21
Using core 'arduino' from platform in folder: /Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21
Detecting libraries used...
"/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR   "-I/Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21/cores/arduino" "-I/Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21/variants/mega" "/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/arduino_build_880660/sketch/sketch_may19a.ino.cpp" -o "/dev/null"
Generating function prototypes...
"/Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR   "-I/Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21/cores/arduino" "-I/Users/daniellecomte/Library/Arduino15/packages/arduino/hardware/avr/1.6.21/variants/mega" "/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/arduino_build_880660/sketch/sketch_may19a.ino.cpp" -o "/var/folders/sv/y8kh1rhd4sz23xbxsnppbp700000gn/T/arduino_build_880660/preproc/ctags_target_for_gcc_minus_e.cpp"
fork/exec /Users/daniellecomte/Library/Arduino15/packages/arduino/tools/avr-gcc/4.9.2-atmel3.5.4-arduino2/bin/avr-g++: no such file or directory
Error compiling for board Arduino/Genuino Mega or Mega 2560.
</code></pre>
 10794: <blockquote>
  <p>avr-g++: no such file or directory</p>
</blockquote>

<p>Try downloading the IDE again. It looks like it has lost sight of where the compiler is. Preferably not a nightly build but one of the stable versions.</p>
