Search for unified libsystemd first then for older libsystemd-journal and...

Search for unified libsystemd first then for older libsystemd-journal and libsystemd-daemon (Initial patch by Cameron Norman)

configure.ac

@@ -212,8 +212,10 @@ AS_IF([test "$enable_daemon" = "yes"],[
 
 AS_IF([test "$enable_systemd" != "no"],[
   AS_CASE([$enable_systemd],
-    [auto],[PKG_CHECK_MODULES([systemd], [libsystemd-daemon libsystemd-journal], [enable_systemd=yes], [enable_systemd=no])],
-    [yes],[PKG_CHECK_MODULES([systemd], [libsystemd-daemon libsystemd-journal])],
+    [auto],[PKG_CHECK_MODULES([systemd], [libsystemd], [enable_systemd=yes], [
+            PKG_CHECK_MODULES([systemd], [libsystemd-daemon libsystemd-journal], [enable_systemd=yes], [enable_systemd=no])])],
+    [yes],[PKG_CHECK_MODULES([systemd], [libsystemd], [], [
+    	    PKG_CHECK_MODULES([systemd], [libsystemd-daemon libsystemd-journal])])],
     [*],[AC_MSG_ERROR([Invalid value of --enable-systemd.])])
     ])