recommend ipp-usb in case of USB scanner capable of IPP-over-USB

sane-airscan.spec

@@ -5,7 +5,7 @@
 
 Name:           sane-airscan
 Version:        0.99.27
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        SANE backend for AirScan (eSCL) and WSD document scanners
 # the exception is defined in LICENSE, meant for SANE project in most cases
 License:        GPLv2+ with exceptions
@@ -45,6 +45,10 @@ when automatic discovery fails - airscan-discover.
 %package -n libsane-airscan
 Summary: SANE backend for eSCL or WSD
 
+# USB scanners which support IPP-over-USB interface can communicate
+# via sane-airscan once ipp-usb brings up an IPP interface for them
+Recommends: ipp-usb
+
 %description -n libsane-airscan
 This package contain a SANE backend for MFP and document scanners that
 implements either eSCL (AirScan/AirPrint scanning) or WSD "driverless"
@@ -87,6 +91,9 @@ mkdir -p %{buildroot}/
 
 
 %changelog
+* Wed Mar 23 2022 Zdenek Dohnal <zdohnal@redhat.com> - 0.99.27-3
+- recommend ipp-usb in case of USB scanner capable of IPP-over-USB
+
 * Sat Jan 22 2022 Fedora Release Engineering <releng@fedoraproject.org> - 0.99.27-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild