+# Output from --help and --version that must not appear in the man page.
+neutralize = \
+ perl -0777 -pi -e 's/\.PP\nId:.*\n//g'
+
+# Differences to ignore when comparing the man page (the date).
+remove_time_stamp = \
+ sed 's/^\(\.TH[^"]*"[^"]*"[^"]*\)"[^"]*"/\1/'