diff --git a/configure.in b/configure.in
index 6419e127..f32324fa 100644
--- a/configure.in
+++ b/configure.in
@@ -122,6 +122,7 @@ BIRD_CHECK_STRUCT_IP_MREQN
 
 if test "$enable_debug" = yes ; then
 	AC_DEFINE(PATH_CONFIG_DIR, ".")
+	AC_DEFINE(PATH_CONTROL_SOCKET_DIR, ".")
 	AC_DEFINE(DEBUGGING)
 	AC_CHECK_LIB(dmalloc, dmalloc_debug)
 	if test $ac_cv_lib_dmalloc_dmalloc_debug != yes ; then
@@ -129,9 +130,11 @@ if test "$enable_debug" = yes ; then
 	fi
 else
 	AC_DEFINE_UNQUOTED(PATH_CONFIG_DIR, "$sysconfdir")
+	AC_DEFINE_UNQUOTED(PATH_CONTROL_SOCKET_DIR, "$localstatedir")
 fi
 
-AC_CONFIG_HEADER(sysdep/autoconf.h)
+mkdir -p $objdir/sysdep
+AC_CONFIG_HEADER($objdir/sysdep/autoconf.h:sysdep/autoconf.h.in)
 AC_OUTPUT_COMMANDS(,[CPP="$CPP" $srcdir/tools/mergedirs $srcdir $srcdir_rel $objdir $sysdep_dirs])
 AC_OUTPUT($makefiles)
 
diff --git a/sysdep/autoconf.h.in b/sysdep/autoconf.h.in
index 6c76f1a9..8d2ebf38 100644
--- a/sysdep/autoconf.h.in
+++ b/sysdep/autoconf.h.in
@@ -44,5 +44,8 @@
 /* Path to configuration files */
 #define PATH_CONFIG_DIR ?
 
+/* Path to control socket */
+#define PATH_CONTROL_SOCKET_DIR ?
+
 /* Are we using dmalloc? */
 #undef HAVE_LIBDMALLOC
diff --git a/sysdep/config.h b/sysdep/config.h
index 6b2f94ab..4699b4f7 100644
--- a/sysdep/config.h
+++ b/sysdep/config.h
@@ -39,5 +39,6 @@ typedef u16 word;
 
 /* Path to configuration file */
 #define PATH_CONFIG PATH_CONFIG_DIR "/bird.conf"
+#define PATH_CONTROL_SOCKET PATH_CONTROL_SOCKET_DIR "/bird.ctl"
 
 #endif
diff --git a/tools/mergedirs b/tools/mergedirs
index 61b092f4..33bcbdaa 100755
--- a/tools/mergedirs
+++ b/tools/mergedirs
@@ -21,7 +21,7 @@ shift
 echo "Merging system-dependent modules ($@)"
 MODULES=`for a in $@ ; do
 		cat $SRCDIR/sysdep/config.h $SRCDIR/$a/Modules |
-		$cpp -U unix -D MACROS_ONLY - |
+		$cpp -U unix -D MACROS_ONLY -I $OBJDIR - |
 		sed "/^[ ]*\$/d;/^#/d;s@\\(.*\\)@\\1 $a/\\1@"
 		done |
 	sort +0 -1 -u |