diff --git a/Makefile.am b/Makefile.am
index 18bb6c68c..2420f3bbf 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -59,7 +59,7 @@ DISTCLEANFILES = intltool-extract intltool-merge intltool-update
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = NetworkManager.pc
 
-ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
+DISTCHECK_CONFIGURE_FLAGS = --enable-more-warnings=error
 
 CLEANFILES = cscope.in.out cscope.out cscope.po.out
 
diff --git a/autogen.sh b/autogen.sh
index 141bcf120..5ec9a5aa8 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -28,5 +28,5 @@ AUTOPOINT='intltoolize --automake --copy' autoreconf --force --install --verbose
 
 cd $olddir
 if test -z "$NOCONFIGURE"; then
-	exec $srcdir/configure --enable-maintainer-mode "$@"
+	exec $srcdir/configure --enable-maintainer-mode --enable-more-warnings=error "$@"
 fi
diff --git a/configure.ac b/configure.ac
index 5f2eb2e85..442f25abd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -364,12 +364,19 @@ AS_IF([test "$with_session_tracking" = "none"], [use_consolekit="no" use_systemd
 AS_IF([test -n "$with_systemd_logind" ], [use_systemd_logind="$with_systemd_logind"])
 AS_IF([test -n "$with_consolekit" ], [use_consolekit="$with_consolekit"])
 # defaults
-AS_IF([test -z "$use_systemd_logind"], [use_systemd_logind="yes"])
+AS_IF([test -z "$use_systemd_logind"], [use_systemd_logind="auto"])
 AS_IF([test -z "$use_consolekit"], [use_consolekit="yes"])
 # output
 session_tracking=
-if test "$use_systemd_logind" = "yes"; then
-	PKG_CHECK_MODULES(SYSTEMD_LOGIN, [libsystemd], , [PKG_CHECK_MODULES(SYSTEMD_LOGIN, [libsystemd-login])])
+if test "$use_systemd_logind" = "yes" -o "$use_systemd_logind" = "auto"; then
+    PKG_CHECK_MODULES(SYSTEMD_LOGIN, [libsystemd], [have_systemd_logind=yes], [PKG_CHECK_MODULES(SYSTEMD_LOGIN, [libsystemd-login], [have_systemd_logind=yes], [have_systemd_logind=no])])
+else
+    have_systemd_logind=no
+fi
+if test "$use_systemd_logind" = "yes" -a "$have_systemd_logind" = "no"; then
+    AC_MSG_ERROR([You must have libsystemd installed to build with systemd-logind support.])
+fi
+if test "$have_systemd_logind" = "yes"; then
 	AC_SUBST(SYSTEMD_LOGIN_CFLAGS)
 	AC_SUBST(SYSTEMD_LOGIN_LIBS)
 	AC_DEFINE([SESSION_TRACKING_SYSTEMD], 1, [Define to 1 if libsystemd-login is available])
diff --git a/libnm-core/nm-dbus-utils.c b/libnm-core/nm-dbus-utils.c
index 1f1e20ced..4bdbdd094 100644
--- a/libnm-core/nm-dbus-utils.c
+++ b/libnm-core/nm-dbus-utils.c
@@ -24,6 +24,7 @@
 #include <gio/gio.h>
 #include <glib/gi18n-lib.h>
 
+#include "nm-glib-compat.h"
 #include "nm-core-internal.h"
 
 typedef struct {
diff --git a/libnm-core/nm-setting.c b/libnm-core/nm-setting.c
index b78d9376f..0791b0d19 100644
--- a/libnm-core/nm-setting.c
+++ b/libnm-core/nm-setting.c
@@ -91,7 +91,7 @@ _nm_gtype_hash (gconstpointer v)
 	return *((const GType *) v);
 }
 
-static void __attribute__((constructor))
+static void
 _ensure_registered (void)
 {
 	if (G_UNLIKELY (registered_settings == NULL)) {
@@ -103,6 +103,12 @@ _ensure_registered (void)
 	}
 }
 
+static void __attribute__((constructor))
+_ensure_registered_constructor (void)
+{
+	_ensure_registered ();
+}
+
 #define _ensure_setting_info(self, priv) \
 	G_STMT_START { \
 		NMSettingPrivate *_priv_esi = (priv); \
diff --git a/libnm-util/nm-setting.c b/libnm-util/nm-setting.c
index 105981bc3..35ae01daf 100644
--- a/libnm-util/nm-setting.c
+++ b/libnm-util/nm-setting.c
@@ -99,7 +99,7 @@ _nm_gtype_hash (gconstpointer v)
 	return *((const GType *) v);
 }
 
-static void __attribute__((constructor))
+static void
 _ensure_registered (void)
 {
 	if (G_UNLIKELY (registered_settings == NULL)) {
@@ -112,6 +112,12 @@ _ensure_registered (void)
 	}
 }
 
+static void __attribute__((constructor))
+_ensure_registered_constructor (void)
+{
+	_ensure_registered ();
+}
+
 #define _ensure_setting_info(self, priv) \
 	G_STMT_START { \
 		NMSettingPrivate *_priv_esi = (priv); \
diff --git a/m4/compiler_warnings.m4 b/m4/compiler_warnings.m4
index 5c8d20777..a1c4e1288 100644
--- a/m4/compiler_warnings.m4
+++ b/m4/compiler_warnings.m4
@@ -22,7 +22,7 @@ AC_DEFUN([NM_COMPILER_WARNING], [
 AC_DEFUN([NM_COMPILER_WARNINGS],
 [AC_ARG_ENABLE(more-warnings,
 	AS_HELP_STRING([--enable-more-warnings], [Possible values: no/yes/error]),
-	set_more_warnings="$enableval",set_more_warnings=error)
+	set_more_warnings="$enableval",set_more_warnings=yes)
 AC_MSG_CHECKING(for more warnings)
 if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
 	AC_MSG_RESULT(yes)
diff --git a/src/main-utils.c b/src/main-utils.c
index 1d899587e..5378ca97a 100644
--- a/src/main-utils.c
+++ b/src/main-utils.c
@@ -34,6 +34,8 @@
 #include <glib-unix.h>
 #include <gmodule.h>
 
+#include "nm-glib-compat.h"
+
 #include "gsystem-local-alloc.h"
 #include "main-utils.h"
 #include "NetworkManagerUtils.h"
diff --git a/src/nm-connectivity.c b/src/nm-connectivity.c
index 1dfcf00b1..f7e7576c2 100644
--- a/src/nm-connectivity.c
+++ b/src/nm-connectivity.c
@@ -26,6 +26,8 @@
 #include <libsoup/soup.h>
 #endif
 
+#include "nm-glib-compat.h"
+
 #include "nm-connectivity.h"
 #include "nm-config.h"
 #include "nm-logging.h"
diff --git a/src/ppp-manager/nm-ppp-manager.c b/src/ppp-manager/nm-ppp-manager.c
index e27c82b70..d410ebfab 100644
--- a/src/ppp-manager/nm-ppp-manager.c
+++ b/src/ppp-manager/nm-ppp-manager.c
@@ -39,6 +39,7 @@
 #ifndef aligned_u64
 #define aligned_u64 unsigned long long __attribute__((aligned(8)))
 #endif
+#include <linux/if.h>
 #include <linux/if_ppp.h>
 
 #include "NetworkManagerUtils.h"
diff --git a/src/settings/plugins/keyfile/writer.c b/src/settings/plugins/keyfile/writer.c
index 9cf119c0c..b6a8786dc 100644
--- a/src/settings/plugins/keyfile/writer.c
+++ b/src/settings/plugins/keyfile/writer.c
@@ -27,6 +27,8 @@
 #include <errno.h>
 #include <string.h>
 
+#include "nm-glib-compat.h"
+
 #include "nm-logging.h"
 #include "writer.h"
 #include "common.h"
diff --git a/src/supplicant-manager/nm-supplicant-manager.c b/src/supplicant-manager/nm-supplicant-manager.c
index d07e23aea..083f2ebcb 100644
--- a/src/supplicant-manager/nm-supplicant-manager.c
+++ b/src/supplicant-manager/nm-supplicant-manager.c
@@ -25,6 +25,8 @@
 #include <glib.h>
 #include <dbus/dbus.h>
 
+#include "nm-glib-compat.h"
+
 #include "nm-supplicant-manager.h"
 #include "nm-supplicant-interface.h"
 #include "nm-logging.h"
diff --git a/src/systemd/nm-sd-adapt.h b/src/systemd/nm-sd-adapt.h
index 049b535c4..929ddc637 100644
--- a/src/systemd/nm-sd-adapt.h
+++ b/src/systemd/nm-sd-adapt.h
@@ -41,6 +41,11 @@
 
 #include "nm-logging.h"
 
+/* Missing in Linux 3.2.0, in Ubuntu 12.04 */
+#ifndef BPF_XOR
+#define BPF_XOR 0xa0
+#endif
+
 /*****************************************************************************/
 
 static inline NMLogLevel
diff --git a/tools/test-networkmanager-service.py b/tools/test-networkmanager-service.py
index 50803c887..6035fecd5 100755
--- a/tools/test-networkmanager-service.py
+++ b/tools/test-networkmanager-service.py
@@ -1148,7 +1148,7 @@ def main():
         sys.exit(1)
 
     # Watch stdin; if it closes, assume our parent has crashed, and exit
-    io = GLib.IOChannel.unix_new(0)
+    io = GLib.IOChannel(0)
     io.add_watch(GLib.IOCondition.HUP, stdin_cb)
 
     # also quit after inactivity to ensure we don't stick around if the above fails somehow