From 7b292b81089fcb23da0e50045ce15fbbd89ee89b Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Wed, 13 Mar 2013 23:42:39 +0100
Subject: [PATCH] simple makefile

---
 field.h | 2 +-
 num.h   | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/field.h b/field.h
index 1aa6d1e9c6..d67c01adcc 100644
--- a/field.h
+++ b/field.h
@@ -369,7 +369,7 @@ const FieldConstants &GetFieldConst() {
 }
 
 void FieldElem::SetInverse(Context &ctx, FieldElem &a) {
-#if 0
+#if defined(USE_FIELDINVERSE_BUILTIN)
     // calculate a^p, with p={45,63,1019,1023}
     FieldElem a2; a2.SetSquare(a);
     FieldElem a3; a3.SetMult(a2,a);
diff --git a/num.h b/num.h
index 3bb8af360c..ff69b11d2c 100644
--- a/num.h
+++ b/num.h
@@ -1,7 +1,12 @@
 #ifndef _SECP256K1_NUM_
 #define _SECP256K1_NUM_
 
-// #include "num_gmp.h"
+#if defined(USE_NUM_GMP)
+#include "num_gmp.h"
+#elif defined(USE_NUM_OPENSSL)
 #include "num_openssl.h"
+#else
+#error "Please select num implementation"
+#endif
 
 #endif