MacVim build hangs on ibtool

[Eric A. Borisch]

Trying to upgrade MacVim on my 10.10.5 box hangs on this command:

system -W <snip>/MacVim/work/macvim-114: ibtool --compile
src/MacVim/English.lproj/Preferences.nib/keyedobjects.nib
src/MacVim/English.lproj/Preferences.nib

Any suggestions?

Thanks,
  - Eric