--- gzlib.c.orig
+++ gzlib.c
@@ -167,6 +167,7 @@ local gzFile gz_open(path, fd, mode)
 #ifdef O_BINARY
             O_BINARY |
 #endif
+            O_CLOEXEC |
             (state->mode == GZ_READ ?
                 O_RDONLY :
                 (O_WRONLY | O_CREAT | (