commit b763f1e0b89a00b561a1f6999005f3fdc0315c45
from: Russ Cox <rsc@swtch.com>
date: Mon Oct 31 13:31:13 2011 UTC

page(1): mention ghostscript, /dev/fd

commit - c383979b0128640f4c658acdd0a383430b49f1da
commit + b763f1e0b89a00b561a1f6999005f3fdc0315c45
blob - 9064df0ef5907368178a63c5d4cd2b462c594783
blob + 99fba2b3f03e753be7e7834c5600506b3d05cd98
--- man/man1/page.1
+++ man/man1/page.1
@@ -270,3 +270,31 @@ document references cannot be sent 
 via plumbing messages.
 .PP
 There are too many keyboard commands and menu items.
+.PP
+Displaying a PostScript or PDF file depends both on having
+GhostScript
+(see
+.IR gs (1))
+installed and on the underlying operating system
+providing a file descriptor device tree at
+.BR /dev/fd .
+.PP
+Some FreeBSD installations
+do not provide file descriptors greater than 2
+in
+.BR /dev/fd .
+To fix this, add
+.IP
+.EX
+/fdescfs    /dev/fd    fdescfs    rw    0    0
+.EE
+.LP
+to
+.BR /etc/fstab ,
+and then
+.B mount
+.BR /dev/fd .
+(Adding the line to
+.B fstab
+ensures causes FreeBSD to mount the file system
+automatically at boot time.)