Added check for f_namelen in struct statfs.

diff --git a/libs/port/statvfs.c b/libs/port/statvfs.c
index fc1f10b..d63c5ab 100644
--- a/libs/port/statvfs.c
+++ b/libs/port/statvfs.c
@@ -57,7 +57,9 @@
         buf->f_bsize   = info.f_bsize;
         buf->f_blocks  = info.f_blocks;
         buf->f_files   = info.f_files;
+#ifdef HAVE_STRUCT_STATFS_F_NAMELEN
         buf->f_namemax = info.f_namelen;
+#endif
 #ifdef HAVE_STRUCT_STATFS_F_FRSIZE
         buf->f_frsize  = info.f_frsize;
 #else