#include <limits.h> is required at least on HP-UX and IRIX. And what's
with HP-UX offering 14 for NAME_MAX?

crypto/LPdir_unix.c

diff --git a/crypto/LPdir_unix.c b/crypto/LPdir_unix.c
index 7298a23..d207a71 100644
--- a/crypto/LPdir_unix.c
+++ b/crypto/LPdir_unix.c
@@ -27,6 +27,7 @@
 
 #include <stddef.h>
 #include <stdlib.h>
+#include <limits.h>
 #include <string.h>
 #include <sys/types.h>
 #include <dirent.h>
@@ -35,6 +36,12 @@
 #include "LPdir.h"
 #endif
 
+#if defined(NAME_MAX) && NAME_MAX<255
+/* HP-UX offers 14 for NAME_MAX, which is far from enough */
+# undef NAME_MAX
+# define NAME_MAX 255
+#endif
+
 struct LP_dir_context_st
 {
   DIR *dir;