Link systemd

Prepare for DBus.

Change-Id: I59b63202db603b5137d7dce62e03f1cde177e675
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/Makefile.am b/Makefile.am
index 0215db3..d93b6da 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2,6 +2,8 @@
 
 phosphor_hwmon_readd_SOURCES = readd.cpp
 phosphor_hwmon_readd_LDADD = libhwmon.la
+phosphor_hwmon_readd_LDFLAGS = $(SYSTEMD_LIBS)
+phosphor_hwmon_readd_CFLAGS = $(SYSTEMD_CFLAGS)
 
 noinst_LTLIBRARIES = libhwmon.la
 libhwmon_la_SOURCES = \
diff --git a/configure.ac b/configure.ac
index 952fcda..aee00f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,7 @@
 # Initialization
 AC_PREREQ([2.69])
 AC_INIT([phosphor-hwmon], [1.0], [https://github.com/openbmc/phosphor-hwmon/issues])
+AC_LANG([C++])
 AC_CONFIG_HEADERS([config.h])
 AM_INIT_AUTOMAKE([subdir-objects -Wall -Werror foreign dist-xz])
 AM_SILENT_RULES([yes])
@@ -12,13 +13,15 @@
 AC_PROG_MAKE_SET
 
 # Checks for libraries.
-
-# Checks for header files.
+PKG_CHECK_MODULES([SYSTEMD], [libsystemd >= 221])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AX_CXX_COMPILE_STDCXX_14([noext])
 AX_APPEND_COMPILE_FLAGS([-fpic -Wall -Werror], [CXXFLAGS])
 
+# Checks for header files.
+AC_CHECK_HEADER(sdbusplus/server.hpp, ,[AC_MSG_ERROR([Could not find sdbusplus/server.hpp...sdbusplus developement package required])])
+
 # Checks for library functions.
 LT_INIT([shared])