--- a/Resources/Orthanc/Core/Compression/ZipWriter.h	Tue Mar 27 11:12:50 2018 +0200
+++ b/Resources/Orthanc/Core/Compression/ZipWriter.h	Wed Mar 28 11:28:27 2018 +0200
@@ -33,6 +33,15 @@
 
 #pragma once
 
+#if !defined(ORTHANC_ENABLE_ZLIB)
+#  error The macro ORTHANC_ENABLE_ZLIB must be defined
+#endif
+
+#if ORTHANC_ENABLE_ZLIB != 1
+#  error ZLIB support must be enabled to include this file
+#endif
+
+
 #include <stdint.h>
 #include <string>
 #include <boost/shared_ptr.hpp>