libcapi20-dev software package provides ISDN utilities - CAPI development libraries, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libcapi20-dev
libcapi20-dev is installed in your system.
Make ensure the libcapi20-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libcapi20-dev *
You will get with libcapi20-dev package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Library development |
| Package | libcapi20-dev |
| Version | 1:3.25+dfsg1-3.3~deb7u1 |
| Description | ISDN utilities - CAPI development libraries |
| Sub Section | libdevel |