Missing quotation marks seem to cause problems with some shells.

src/Makefile.in

@@ -59,7 +59,7 @@ XCAM_OBJS = xcam.o preferences.o gtkglue.o
 all: $(PROGRAMS)
 
 install: $(PROGRAMS)
-	@if test -z $(BINPROGS) ; then \
+	@if test -z "$(BINPROGS)" ; then \
 	  echo "*** The list of frontends to install is empty." ; \
 	  echo "*** Check the output of configure and the file config.log," ; \
 	  echo "*** maybe the GTK libraries weren't found?" ; \