" Adding these lines in .vimrc usually helps with .oc and .oh files

function SetOblivcOptions()
  " Hijack C syntax highlighting and indenting
  set filetype=c
  syn match ocConditional "\<obliv\s\+if\>"
  syn keyword cType frozen
  syn match ocOblivType "\<obliv\>\(\s\+if\>\)\@!"
  syn match cStatement "\~obliv\>"
  hi def link ocConditional Conditional
  hi def link ocOblivType Type
endfunction

autocmd BufNewFile,BufRead *.o[ch] call SetOblivcOptions()