Binary package “exim4-dev” in ubuntu focal

header files for the Exim MTA (v4) packages

 Exim (v4) is a mail transport agent. This package contains header
 files that can be used to compile code that is then dynamically linked
 to exim's local_scan interface.
 The Debian exim4 packages have their own web page, There is also a Debian-specific
 FAQ list. Information about the way the Debian packages are
 configured can be found in
 /usr/share/doc/exim4-base/README.Debian.gz, which additionally contains
 information about the way the Debian binary packages are built. The
 very extensive upstream documentation is shipped in
 /usr/share/doc/exim4-base/spec.txt.gz. To repeat the debconf-driven
 configuration process in a standard setup, invoke dpkg-reconfigure
 exim4-config. There is a Debian-centered mailing list, Please ask Debian-specific
 questions there, and only write to the upstream exim-users mailing
 list if you are sure that your question is not Debian-specific. You
 can find the subscription web page on