Plan 9 doesn't do nm, from Russ Cox.

p4raw-id: //depot/perl@18586

diff --git a/Configure b/Configure
index 6ce7766..47e3635 100755 (executable)
--- a/Configure
+++ b/Configure
@@ -5470,6 +5470,11 @@ case "$usenm" in
                        echo "'nm' won't be sufficient on this sytem." >&4
                        dflt=n
                fi
+               if $test "$osname" = plan9; then
+                       echo " "
+                       echo "Whoops!  Nm won't work on Plan 9!" >&4
+                       dflt=n
+               fi
                ;;
        esac
        case "$dflt" in