Our collaborator was not able to install synapser due to this error with PythonEmbedInR.
It works on my Mac running R v. 3.4. I upgraded to 3.6 and verified it works. can you please find out what kind of machine and what version of R the collaborator is using?
I am not sure why your colleague's MacOS installation of R is trying to install the package as source rather than binary. I have two requests for them:
(1) Please return the result of running this R command:
(2) Try 'forcing' the use of the binary version of the package:
> install.packages("synapser", repos=c("http://ran.synapse.org", "http://cran.fhcrc.org"), type="binary")