--- running R CMD build for opencpu (project opencpu)
* checking for file 'opencpu/DESCRIPTION' ... OK
* preparing 'opencpu':
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
-----------------------------------
ERROR: dependency 'protolite' is not available for package 'opencpu'
* removing '/tmp/RtmpBEFpD6/Rinst347ed428b4bfd/opencpu'
-----------------------------------
ERROR: package installation failed
*** WARNING: expected tar ball opencpu_2.2.5.tar.gz does not exist!
opencpu is not a package in opencpu_2.2.5.tar.gz, skipping R CMD check