diff -Naur backends-1.0.30/backend/dll.conf.in backends-1.0.30-r1/backend/dll.conf.in
--- backends-1.0.30/backend/dll.conf.in	2020-05-17 14:16:28.000000000 +0300
+++ backends-1.0.30-r1/backend/dll.conf.in	2020-06-27 08:24:18.378856341 +0300
@@ -98,3 +98,7 @@
 #umax_pp
 v4l
 xerox_mfp
+# Add support for the HP-specific backend.  Needs net-print/hplip installed.
+hpaio
+# Add support for the Epson-specific backend.  Needs media-gfx/iscan installed.
+epkowa