master: Possibly avoid trying to call nonexistent openpty

The branch "master" has been updated in SBCL:
       via  26add0a4ad21b7ab2ee10a10cd95b31051f174a0 (commit)
      from  bc13902c286979773016e3e7b84c6049ff53c320 (commit)

- Log -----------------------------------------------------------------
commit 26add0a4ad21b7ab2ee10a10cd95b31051f174a0
Author: Douglas Katzman <[email protected]>
Date:   Fri May 1 00:31:15 2026 -0400

    Possibly avoid trying to call nonexistent openpty
---
 contrib/sb-posix/posix-tests.lisp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/contrib/sb-posix/posix-tests.lisp b/contrib/sb-posix/posix-tests.lisp
index e901ef79a..de20f3704 100644
--- a/contrib/sb-posix/posix-tests.lisp
+++ b/contrib/sb-posix/posix-tests.lisp
@@ -718,7 +718,13 @@
         (= new (sb-posix:cfgetospeed termios))))
   t)
 
+;;; openpty is not in libc on many Linux distros. Instead it is in /usr/lib/libutil.so
+;;; which is not linked because nothing else needs it. So maybe skip a test
 #-win32
+(when (sb-sys:find-dynamic-foreign-symbol-address "openpty")
+  (push :have-openpty *features*))
+
+#+have-openpty
 (deftest tcsetattr.smoke.pty
     (let (master-fd slave-fd)
       (unwind-protect

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