From 01c7f20170628a59ee8c76a0729576fb67dfa094 Mon Sep 17 00:00:00 2001
From: Jean Flach <jean-marcel.flach@icinga.com>
Date: Tue, 27 Feb 2018 15:54:58 +0100
Subject: [PATCH] Require systemd headers

Only mandatory if using systemd
---
 INSTALL.md              | 4 ++++
 lib/base/CMakeLists.txt | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/INSTALL.md b/INSTALL.md
index 98251784c..c7b5db363 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -44,6 +44,10 @@ application using a dist tarball (including notes for distributions):
   - Alpine: boost-dev
 * GNU bison (bison)
 * GNU flex (flex) >= 2.5.35
+* Systemd headers
+  - Only required when using Systemd
+  - Debian/Ubuntu: libsystemd-dev
+  - RHEL/Fedora: systemd-devel
 
 ## Optional features
 
diff --git a/lib/base/CMakeLists.txt b/lib/base/CMakeLists.txt
index 73a8f5fc7..29daa94a0 100644
--- a/lib/base/CMakeLists.txt
+++ b/lib/base/CMakeLists.txt
@@ -97,6 +97,13 @@ if(ICINGA2_UNITY_BUILD)
   mkunity_target(base base base_SOURCES)
 endif()
 
+if(HAVE_SYSTEMD)
+  find_path(SYSTEMD_INCLUDE_DIR
+    NAMES systemd/sd-daemon.h
+    HINTS ${SYSTEMD_ROOT_DIR})
+  include_directories(${SYSTEMD_INCLUDE_DIR})
+endif()
+
 add_library(base OBJECT ${base_SOURCES})
 
 include_directories(${icinga2_SOURCE_DIR}/third-party/execvpe)