add note about limited Red Hat support

gpsd.spec

@@ -9,6 +9,8 @@
 
 %global scons_ver 4.6.0
 %global scons python3 scons-%{scons_ver}/scripts/scons.py
+%global note1 The Red Hat support for this package is limited. See
+%global note2 https://access.redhat.com/support/policy/gpsd-support for more details.
 
 Name:           gpsd
 Version:        3.25
@@ -151,6 +153,10 @@ do not reference it or depend on it in any way.
 %patch -P 2 -p1 -b .scanfixes
 %patch -P 3 -p1 -b .busywait
 
+# add note to man pages about limited support
+sed -i ':a;$!{N;ba};s|\(\.SH "[^"]*"\)|.SH "NOTE"\n%{note1}\n%{note2}\n\1|3' \
+    man/*.{1,8}
+
 # don't try reloading systemd when installing in the build root
 sed -i 's|systemctl daemon-reload|true|' SConscript