* recommended: libexecinfo on FreeBSD (automatically used when Icinga 2 is
installed via port or package)
* optional: MySQL (mysql-devel on RHEL, libmysqlclient-dev on Debian); set CMake
- variable `ICINGA2_WITH_MYSQL` to disable this module
+ variable `ICINGA2_WITH_MYSQL` to `OFF` to disable this module
* optional: PostgreSQL (postgresql-devel on RHEL, libpq-dev on Debian); set CMake
- variable `ICINGA2_WITH_PGSQL` to disable this module
+ variable `ICINGA2_WITH_PGSQL` to `OFF` to disable this module
* optional: YAJL (yajl-devel on RHEL, libyajl-dev on Debian)
Note: RHEL5 ships an ancient flex version. Updated packages are available for