libcapnp-dev software package provides Cap'n Proto C++ library (development files), you can install in your Ubuntu 17.04 (Zesty Zapus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libcapnp-dev
libcapnp-dev is installed in your system.
Make ensure the libcapnp-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libcapnp-dev *
You will get with libcapnp-dev package name, version, architecture and description in a table
| Distro | Ubuntu 17 04 zesty zapus |
| Section | Library development |
| Package | libcapnp-dev |
| Version | 0.5.3-2ubuntu1 |
| Description | Cap'n Proto C++ library (development files) |
| Sub Section | libdevel |