From 062c7927d00c95490599735c9bd5ab54fb6a296b Mon Sep 17 00:00:00 2001
From: Lovell Fuller <github@lovell.info>
Date: Mon, 18 May 2015 16:35:50 +0100
Subject: [PATCH] Ensure libvips version requirement

Should improve debugging, e.g. #222
---
 src/common.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/common.cc b/src/common.cc
index 6bc403a2d..4ad2f77c8 100755
--- a/src/common.cc
+++ b/src/common.cc
@@ -6,6 +6,10 @@
 
 // Verify platform and compiler compatibility
 
+#if (VIPS_MAJOR_VERSION < 7 || (VIPS_MAJOR_VERSION == 7 && VIPS_MINOR_VERSION < 40))
+#error libvips version 7.40.0+ required - see https://github.com/lovell/sharp#prerequisites
+#endif
+
 #ifdef _WIN64
 #error Windows 64-bit is currently unsupported - see https://github.com/lovell/sharp#windows
 #endif