From: Nick Gasson <nick@nickg.me.uk>
Date: Sun, 24 May 2020 17:53:44 +0800
Subject: Fix unassigned variable error in mitscheme.init

Without (load-option 'synchronous-subprocess) MIT-Scheme has the
following error when loading the init file:

    ;Loading "/usr/share/slib/mitscheme.init"...
    ;Unassigned variable: run-shell-command
---
 mitscheme.init | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mitscheme.init b/mitscheme.init
index 8e07241..bb21a9e 100755
--- a/mitscheme.init
+++ b/mitscheme.init
@@ -222,6 +222,8 @@
 	Xwindows
 	))
 
+(load-option 'synchronous-subprocess)  ; For run-shell-command.
+
 (define system run-shell-command)
 (define (print-call-stack port) #f)
 
