Install a Freedesktop-compliant desktop file

This makes it possible for desktop environment (GNOME, KDE, XFCE, LXDE, E17,
and so on) display an icon for dwt. Also, the icon enables to use startup
notification (GTK+ provides built-in support for this).

Makefile

@@ -13,7 +13,7 @@ PKG_MODULES := vte-2.90
 PKG_CFLAGS  := $(shell pkg-config --cflags $(PKG_MODULES))
 PKG_LDLIBS  := $(shell pkg-config --libs   $(PKG_MODULES))
 
-all: dwt dwt.1
+all: dwt dwt.1 dwt.desktop
 
 dwt: CFLAGS += $(PKG_CFLAGS)
 dwt: LDLIBS += $(PKG_LDLIBS)
@@ -33,6 +33,8 @@ install: all
 	install -m 755 -t $(DESTDIR)$(PREFIX)/bin dwt
 	install -m 755 -d $(DESTDIR)$(PREFIX)/man/man1
 	install -m 644 -t $(DESTDIR)$(PREFIX)/man/man1 dwt.1
+	install -m 755 -d $(DESTDIR)$(PREFIX)/share/applications
+	install -m 644 -t $(DESTDIR)$(PREFIX)/share/applications dwt.desktop
 
 ifeq ($(origin TAG),command line)
 VERSION := $(TAG)

dwt.desktop

@@ -0,0 +1,13 @@
+[Desktop Entry]
+Hidden=false
+Name=dwt
+Exec=dwt
+TryExec=dwt
+Icon=terminal
+Comment=Use the command line
+Type=Application
+NoDisplay=false
+StartupNotify=true
+StartupWMClass=Dwt
+Categories=GNOME;GTK;Utility;TerminalEmulator;
+Terminal=false