Missing piece of tstbackend integration.

frontend/Makefile.in

@@ -51,7 +51,7 @@ DISTCLEAN_FILES = @DISTCLEAN_FILES@
 
 @SET_MAKE@
 
-BINPROGS = scanimage
+BINPROGS = scanimage # tstbackend
 SBINPROGS = $(SANED)
 PROGRAMS = $(BINPROGS) $(SBINPROGS)
 TESTPROGRAMS = test
@@ -99,8 +99,13 @@ saned: saned.o $(LIBSANEI) $(LIBSANE) $(LIBLIB)
 scanimage: $(SCAN_OBJS) $(LIBSANE) $(LIBLIB)
 	@$(LIBTOOL) $(MLINK) $(LINK) $(SCAN_OBJS) $(LIBSANE) $(LIBLIB) $(LIBS)
 
+# tstbackend is not compiled by default. 
+# To compile it, add tstbackend to BINPROGS.
+tstbackend: tstbackend.o $(LIBSANE) $(LIBLIB)
+	@$(LIBTOOL) $(MLINK) $(LINK) tstbackend.o $(LIBSANE) $(LIBLIB) $(LIBS)
+
 clean:
-	rm -f *.o
+	rm -f *.o tstbackend
 	rm -rf .libs
 
 distclean: clean