diff --git a/devel/bison/patches/patch-lib_spawni.c b/devel/bison/patches/patch-lib_spawni.c
new file mode 100644
index 000000000..2dcbd7cb7
--- /dev/null
+++ b/devel/bison/patches/patch-lib_spawni.c
@@ -0,0 +1,17 @@
+$NetBSD$
+
+--- lib/spawni.c.orig	Mon Apr  8 09:18:57 2013
++++ lib/spawni.c
+@@ -223,10 +223,12 @@ __spawni (pid_t *pid, const char *file,
+     }
+ #endif
+ 
++#ifndef __minix
+   /* Set the process group ID.  */
+   if ((flags & POSIX_SPAWN_SETPGROUP) != 0
+       && setpgid (0, attrp->_pgrp) != 0)
+     _exit (SPAWN_ERROR);
++#endif
+ 
+   /* Set the effective user and group IDs.  */
+   if ((flags & POSIX_SPAWN_RESETIDS) != 0