set default for sysconfdir to /etc; create default configuration directory '/etc/ebusd' during 'make install'.

configure.ac

@@ -1,6 +1,11 @@
 AC_PREREQ([2.65])
 AC_INIT([ebusd], [0.5.0], [ebusd@liwest.at], [ebusd], [https://github.com/yuhu-/ebusd])
 
+case "$@" in
+	*"--sysconfdir="*) ;;
+	*) sysconfdir=/etc ;;
+esac
+
 if test -z $CXXFLAGS;
 	then CXXFLAGS='-g -O2'
 fi

src/ebusd/Makefile.am

@@ -23,3 +23,5 @@ distclean-local:
 	-rm -f Makefile.in
 	-rm -rf .libs
 
+install-data-local:
+	[ -d $(sysconfdir)/ebusd ] || mkdir -p $(sysconfdir)/ebusd