## Build system

### Configure

In `configure.ac` a variable should be defined that contains the location where the .panel-applet files are installed. You can fetch this directory during `configure` with the following code:

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    LIBPANEL_APPLET_DIR=`$PKG_CONFIG --variable=libpanel_applet_dir libpanel-applet`
    AC_SUBST(LIBPANEL_APPLET_DIR)

### Makefiles

A typical Makefile for that is used to build and install an applet contains the following declarations:

- A rule to install the `.panel-applet` file.

- A rule to install the D-Bus service file if the applet is an out process applet.

- The `.panel-applet` file and the D-Bus `.service` file are added to EXTRA_DIST and CLEANFILES.

#### Installing the Panel Applet File

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    appletdir       = $(LIBPANEL_APPLET_DIR)
    applet_in_files = org.gnome.HelloWorld.panel-applet.in
    applet_DATA     = $(applet_in_files:.panel-applet.in=.panel-applet)

    $(applet_in_files): $(applet_in_files).in Makefile
        $(AM_V_GEN)sed \
        -e "s|\@LIBEXECDIR\@|$(libexecdir)|" \
        -e "s|\@VERSION\@|$(PACKAGE_VERSION)|" \
        $< > $@

    %.panel-applet: %.panel-applet.in \
                    $(INTLTOOL_MERGE) $(wildcard $(top_srcdir)/po/*po) ; \
                    $(INTLTOOL_MERGE) $(top_srcdir)/po $< $@ -d -u -c $(top_builddir)/po/.intltool-merge-cache

#### Installing the D-Bus service file

To install the service file the following rule can be placed in the applets Makefile:

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    servicedir       = $(datadir)/dbus-1/services
    service_in_files = org.gnome.panel.applet.HelloWorldFactory.service.in
    service_DATA     = $(service_in_files:.service.in=.service)

    org.gnome.panel.applet.HelloWorldFactory.service: $(service_in_files)
        $(AM_V_GEN) sed -e "s|\@LOCATION\@|$(APPLET_LOCATION)|" $< > $@

#### Distribution and Cleanup

Add panel-applet .in.in and service file to EXTRA_DIST and $(applet_DATA) $(applet_DATA).in to CLEANFILES

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    EXTRA_DIST = \
        GNOME_MixerApplet.panel-applet.in.in \
        $(service_in_files) \
        $(ui_DATA) \
        $(schemas_in_files)

    CLEANFILES = $(applet_DATA) $(applet_DATA).in $(service_DATA) $(schemas_DATA)