Dependencies by OS

The dependencies versions shipped by the officially supported OSes.

Icinga 2

Dependency	Debian 8	9	Ubuntu 16.04	18.04	18.10
CMake	3.0.2	3.7.2	3.5.1	3.10.2	3.12.1
make	4.0	4.1	4.1	4.1	4.2.1
GCC	4.9.2	6.3.0	5.3.1	7.3.0	8.2.0
pkg-config	0.28	0.29	0.29.1	0.29.1	0.29.1
OpenSSL	1.0.1t	1.1.0j	1.0.2g	1.1.0g	1.1.1
Boost	1.55.0	1.62.0	1.58.0	1.65.1	1.67.0
bison	3.0.2	3.0.4	3.0.4	3.0.4	3.0.4
flex	2.5.39	2.6.1	2.6.0	2.6.4	2.6.4
systemd	215	232	229	237	239
MySQL	5.5.62	10.1.37	5.7.25	5.7.25	5.7.25
PostgreSQL	9.4.21	9.6.11	9.5.14	10.6	10.6
YAJL	2.1.0	2.1.0	2.1.0	2.1.0	2.1.0
libedit	3.1	3.1	3.1	3.1	3.1

Dependency	CentOS * 6	7	Fedora 28	29
CMake	3.6.1	3.13.4	3.11.2	3.12.1
make	3.81	3.82	4.2.1	4.2.1
GCC	7.3.1	8.2.1	8.2.1	8.2.1
pkg-config	0.23	0.27.1	0.29.1	0.29.1
OpenSSL	1.0.1e	1.0.2k	1.1.0i	1.1.1a
Boost	1.48.0	1.53.0	1.66.0	1.66.0
bison	2.4.1	3.0.4	3.0.4	3.0.5
flex	2.5.35	2.5.37	2.6.1	2.6.1
systemd	N/A	219	238	239
MySQL	10.2.8	10.2.8	10.2.21	10.3.12
PostgreSQL	9.6.10	9.6.10	10.6	10.7
YAJL	1.0.7	2.0.4	2.1.0	2.1.0
libedit	2.11	3.0	3.1	3.1
ncurses	5.7	5.9	6.1	6.1

* with SCL and EPEL

Dependency	12.3	12.4	15.0	openSUSE 42.3	15.0
CMake	3.5.2	3.5.2	3.10.2	3.5.2	3.10.2
make	4.0	4.0	4.2.1	4.0	4.2.1
GCC	4.8	4.8	7	4.8	7
pkg-config	0.28	0.28	0.29.2	0.28	0.29.2
OpenSSL	1.0.2j	1.0.2p	1.1.0i	1.0.2j	1.1.0i
Boost	1.54.0	1.54.0	1.66.0	1.54.0	1.66.0
bison	2.7	2.7	3.0.4	2.7	3.0.4
flex	2.5.37	2.5.37	2.6.4	2.5.37	2.6.4
systemd	228	228	234	228	234
MariaDB	10.0.35	10.2.21	10.2.22	10.0.35	10.2.15
PostgreSQL	10.6	10.6	10.6	9.6	10
YAJL	2.0.1	2.0.1	2.1.0	2.0.1	2.1.0
libedit	3.1	3.1	3.1	3.1	3.1
ncurses	5.9	5.9	6.1	5.9	6.1

Windows doesn't ship such dependencies by itself so the packagers have to install all of them from upstream.