From 01987c093e2cfbd46115cc58e4ff9f789efb9d0d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Thu, 7 Sep 2023 18:03:40 +0200
Subject: Enable let-env to unset variables.

---
 module/hnh/util/env.scm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'module/hnh/util/env.scm')

diff --git a/module/hnh/util/env.scm b/module/hnh/util/env.scm
index 18ec0543..bb42d966 100644
--- a/module/hnh/util/env.scm
+++ b/module/hnh/util/env.scm
@@ -14,7 +14,11 @@
                     (list n new-value (getenv n)))
                   (list (symbol->string (quote name)) ...)
                   (list value ...)))
-           (for-each (lambda (pair) (setenv (car pair) (cadr pair)))
+           (for-each (lambda (pair)
+                       (if (cadr pair)
+                           (setenv (car pair)
+                                   (cadr pair))
+                           (unsetenv (car pair))))
                      env-pairs))
          (lambda () body ...)
          (lambda ()
-- 
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