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-rw-r--r--lib/spawn.in.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/spawn.in.h b/lib/spawn.in.h
index e8116f9..b4b9197 100644
--- a/lib/spawn.in.h
+++ b/lib/spawn.in.h
@@ -142,7 +142,8 @@ typedef struct
# endif
#endif
/* A GNU extension. Use the next free bit position. */
-#define POSIX_SPAWN_USEVFORK \
+#ifndef POSIX_SPAWN_USEVFORK
+# define POSIX_SPAWN_USEVFORK \
((POSIX_SPAWN_RESETIDS | (POSIX_SPAWN_RESETIDS - 1) \
| POSIX_SPAWN_SETPGROUP | (POSIX_SPAWN_SETPGROUP - 1) \
| POSIX_SPAWN_SETSIGDEF | (POSIX_SPAWN_SETSIGDEF - 1) \
@@ -152,6 +153,7 @@ typedef struct
| POSIX_SPAWN_SETSCHEDULER \
| (POSIX_SPAWN_SETSCHEDULER > 0 ? POSIX_SPAWN_SETSCHEDULER - 1 : 0)) \
+ 1)
+#endif
#if !GNULIB_defined_verify_POSIX_SPAWN_USEVFORK_no_overlap
typedef int verify_POSIX_SPAWN_USEVFORK_no_overlap
[(((POSIX_SPAWN_RESETIDS | POSIX_SPAWN_SETPGROUP