Invoke psdownload via the 9 script.

bin/psfonts

diff --git a/bin/psfonts b/bin/psfonts
index 7cd1ae0..0d4b606 100755
--- a/bin/psfonts
+++ b/bin/psfonts
@@ -1,4 +1,4 @@
 #!/bin/sh
 
 echo %!PS-Adobe-2.0
-exec psdownload -f -mfontmap -r $PLAN9'/postscript/font/lw+' "$@"
+exec 9 psdownload -f -mfontmap -r $PLAN9'/postscript/font/lw+' "$@"