Chief Delphi - Building FRC Gazebo Plugins for Mac OSX causing problems

I'm trying to set up gazebo on my mac using this guide: http://wpilib.screenstepslive.com/s/...nually-mac-osx But whenever I get to the

Code:

./gradlew -PmakeSim frc_gazebo_plugins

step I get this error message:

Code:

2 errors generated.

make[3]: *** [simulation/frc_gazebo_plugins/CMakeFiles/limit_switch.dir/limit_switch/src/external_limit_switch.cpp.o] Error 1

make[2]: *** [simulation/frc_gazebo_plugins/CMakeFiles/limit_switch.dir/all] Error 2

make[1]: *** [simulation/frc_gazebo_plugins/CMakeFiles/frc_gazebo_plugins.dir/rule] Error 2

make: *** [frc_gazebo_plugins] Error 2

:wpilibc:frc_gazebo_plugins FAILED



FAILURE: Build failed with an exception.



* What went wrong:

Execution failed for task ':wpilibc:frc_gazebo_plugins'.

> Process 'command 'make'' finished with non-zero exit value 2



* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.



BUILD FAILED

Does anyone have any Ideas?