Use systemctl binary to detect systemd

Fixes #91

CMakeLists.txt

@@ -21,7 +21,7 @@ find_program(BASE64 base64 DOC "path to base64 executable")
 find_program(OPENSSL openssl DOC "path to OpenSSL executable")
 find_program(INSSERV insserv DOC "path to insserv executable")
 find_program(CHKCONFIG chkconfig DOC "path to chkconfig executable")
-find_program(SYSTEMD systemd)
+find_program(SYSTEMCTL systemctl DOC "path to systemctl executable")
 find_library(LIBSOCKET socket)
 find_library(LIBNSL nsl)
 
@@ -66,7 +66,7 @@ check_type_size("unsigned long" SIZEOF_UNSIGNED_LONG)
 add_definitions(-DSIZEOF_UNSIGNED_LONG=${SIZEOF_UNSIGNED_LONG})
 
 if(NOT DEFINED INIT_FLAVOR)
-    if(SYSTEMD)
+    if(SYSTEMCTL)
         message(STATUS "Detected init flavor: systemd")
         set(INIT_FLAVOR "systemd" CACHE STRING "Init daemon of this system")
     elseif(IS_DIRECTORY "${SYSCONF_DIR}/init" AND EXISTS "/lib/init/upstart-job")