From 06a523423abeb3993c2ea6f149f10230cda58e8a Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Sun, 26 Nov 2017 00:11:56 +0100
Subject: [PATCH] Oh, the joy of compilers pretending to support C99, but that
 actually don't

---
 configure.ac                 | 1 +
 src/libsodium/sodium/utils.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index ab79ca12..26f81d07 100644
--- a/configure.ac
+++ b/configure.ac
@@ -189,6 +189,7 @@ dnl Checks
 AC_PROG_CC_C99
 AM_PROG_AS
 AC_USE_SYSTEM_EXTENSIONS
+AC_C_VARARRAYS
 
 AC_CHECK_DEFINE([__native_client__], [NATIVECLIENT="yes"], [])
 
diff --git a/src/libsodium/sodium/utils.c b/src/libsodium/sodium/utils.c
index b45f2325..91e79c77 100644
--- a/src/libsodium/sodium/utils.c
+++ b/src/libsodium/sodium/utils.c
@@ -128,7 +128,7 @@ sodium_stackzero(const size_t len)
 {
 #ifdef HAVE_ALLOCA
     sodium_memzero(alloca(len), len);
-#elif __STDC_VERSION__ >= 199901L
+#elif HAVE_C_VARARRAYS
     unsigned char fodder[len];
     sodium_memzero(fodder, len);
 #endif