drracket / postgresql error when opening connection for syntax

Folks,

I’m experimenting with creating functions from a PostgreSQL database.
[Frankly, I’m still getting my head around what I _actually_ want to do
here, but...]

When I load the following into DrRacket:

;; -------------------------------------
#lang racket/base
(require (for-syntax db racket/base))

(define-for-syntax pga
  (postgresql-connect
   #:user "tim"
   #:password "souper-secret-passwor*"
   #:port 5432
   #:database "tims_db"
   #:server "localhost"))
;; -------------------------------------

I get the following in my status line:

subprocess: forbidden (execute) access to /bin/uname

This is causing my background execution to fail (red dot); although
foreground execution is happy.

I cannot find uname in the source; or in my .racketrc or anywhere in
~/.racket/ .

Anyone have any clues?

Tim

Versions:

$ racket
Welcome to Racket v6.4.
> (version)
"6.4"

$ uname -a
Linux tim-8 4.4.0-1-amd64 #1 SMP Debian 4.4.6-1 (2016-03-17) x86_64
GNU/Linux

-- 
Tim Brown CEng MBCS <[email protected]>
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