Install umax_pp backend tools if the backend is built

configure.in

@@ -667,8 +667,12 @@ for backend in ${BACKENDS} ; do
   BACKEND_LIBS_ENABLED="${BACKEND_LIBS_ENABLED} libsane-${backend}.la"
   BACKEND_CONFS_ENABLED="${BACKEND_CONFS_ENABLED} ${backend}.conf"
   BACKEND_MANS_ENABLED="${BACKEND_MANS_ENABLED} sane-${backend}.5"
+  if test x$backend = xumax_pp; then
+    install_umax_pp_tools=yes
+  fi
 done
 AC_SUBST(BACKEND_LIBS_ENABLED)
+AM_CONDITIONAL(INSTALL_UMAX_PP_TOOLS, test xyes = x$install_umax_pp_tools)
 
 AC_ARG_VAR(PRELOADABLE_BACKENDS, [list of backends to preload into single DLL])
 if test "${enable_preload}" = "auto"; then

tools/Makefile.am

@@ -8,7 +8,12 @@ AM_CPPFLAGS = -I. -I$(srcdir) -I$(top_builddir)/include \
  -I$(top_srcdir)/include
 
 bin_PROGRAMS = sane-find-scanner gamma4scanimage
-noinst_PROGRAMS = sane-desc umax_pp
+noinst_PROGRAMS = sane-desc
+if INSTALL_UMAX_PP_TOOLS
+bin_PROGRAMS = umax_pp
+else
+noinst_PROGRAMS = umax_pp
+endif
 
 if CROSS_COMPILING
 HOTPLUG =