data: Add --with-udevrulesdir configure option

Makefile.am

@@ -1,5 +1,7 @@
 SUBDIRS = data src docs
 
-DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc
+DISTCHECK_CONFIGURE_FLAGS =								\
+	--enable-gtk-doc								\
+	--with-udevrulesdir=$$dc_install_base/$(udevrulesdir)
 
 EXTRA_DIST = README.md

configure.ac

@@ -16,6 +16,12 @@ GNOME_COMPILE_WARNINGS([maximum])
 
 GTK_DOC_CHECK([1.11],[--flavour no-tmpl])
 
+AC_ARG_WITH([udevrulesdir],
+	    AS_HELP_STRING([--with-udevrulesdir=DIR], [Directory for udev rules]),
+	    [],
+	    [with_udevrulesdir=$($PKG_CONFIG --variable=udevdir udev)"/rules.d"])
+AC_SUBST([udevrulesdir], [$with_udevrulesdir])
+
 PKG_CHECK_MODULES(IIO_SENSOR_PROXY, gio-2.0 gudev-1.0)
 
 AC_PATH_PROG([GDBUS_CODEGEN],[gdbus-codegen])

data/Makefile.am

@@ -1,5 +1,4 @@
-rulesdir = /lib/udev/rules.d/
-rules_DATA = 40-iio-sensor-proxy.rules
+udevrules_DATA = 40-iio-sensor-proxy.rules
 
 servicedir = /usr/lib/systemd/system/
 service_DATA = iio-sensor-proxy.service
@@ -10,4 +9,4 @@ dbus_confdir = /etc/dbus-1/system.d
 dbus_conf_DATA = net.hadess.SensorProxy.conf
 
 CLEANFILES = iio-sensor-proxy.service
-EXTRA_DIST = $(rules_DATA) $(dbus_conf_DATA) iio-sensor-proxy.service.in
+EXTRA_DIST = $(udevrules_DATA) $(dbus_conf_DATA) iio-sensor-proxy.service.in