lcm-gen failed on bot-lcmgl

[RussTedrake]

i've been trying to test all of the open PRs on mac, but can't even build master this morning. I'm currently failing on

[ 23%] Performing configure step for 'bot2-lcmgl'
loading initial cache file /Users/russt/drake-distro/build/externals/libbot/bot2-lcmgl-prefix/tmp/bot2-lcmgl-cache-Release.cmake
CMake Error at cmake/lcmtypes.cmake:115 (message):
  lcm-gen failed
Call Stack (most recent call first):
  cmake/lcmtypes.cmake:166 (lcmgen)
  cmake/lcmtypes.cmake:479 (lcmtypes_build_c)
  CMakeLists.txt:8 (lcmtypes_build)

not sure yet what changed...

[RussTedrake]

possibly addressed with #2777

[jamiesnape]

@jhoare @mwoehlke-kitware Please check whether #2777 addresses this.

[jhoare]

I don't have a way to test this right now but the main reason why I made #2777 was because when I changed generators things would go bad if I did not go through and delete the pod-build folders that were created in libbot.

The command I was running was (from drake-distro):

 $ find . -name pod-build -exec rm -rf {} \;

I don't think that's the error you're experiencing, but I can't know for sure.

[RussTedrake]

that was it. thanks.