From 5fcf093b8a8880bda56e0b9afe0dee8e9927c4c5 Mon Sep 17 00:00:00 2001
From: Richard Ipsum <richardipsum@fastmail.co.uk>
Date: Sat, 3 Jun 2017 20:58:03 +0100
Subject: README: add build instructions

---
 README | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/README b/README
index 9bed714..281956d 100644
--- a/README
+++ b/README
@@ -6,11 +6,26 @@ verification library.  lua-scrypt uses the [libscrypt][] library and
 provides a simple interface for hashing and verifying passwords.
 
     local scrypt = require "scrypt"
-    
+
     local hash = scrypt.hash_password("Hello world")
 
     assert(scrypt.verify_password(hash, "Hello world"))
 
+Installation
+============
+
+To compile lua-scrypt, on platforms with libscrypt 1.21 or later run,
+
+    $ make CFLAGS+=-DTRUST_LIBSCRYPT_SALT_GEN
+
+for platforms with older versions (earlier than 1.21) of libscrypt run,
+
+    $ make
+
+To install lua-scrypt, run,
+
+    $ make install
+
 Thanks
 ======
 
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