When you build pinba for percona 5.7.21 on ubuntu 16.04, linker fails on the final step as it can't find a library at the location percona-source/libservices/libmysqlservices.a
But the library exists at percona-source/archive_output_directory/
So the workaround cp percona-source/archive_output_directory/libmysqlservices.a percona-source/libservices/ does the trick.
When you build pinba for percona 5.7.21 on ubuntu 16.04, linker fails on the final step as it can't find a library at the location percona-source/libservices/libmysqlservices.a
But the library exists at percona-source/archive_output_directory/
So the workaround
cp percona-source/archive_output_directory/libmysqlservices.a percona-source/libservices/does the trick.