Build depends on zlib.h (zlib1g-dev)

debian/control

@@ -2,7 +2,7 @@ Source: i2pd
 Section: net
 Priority: optional
 Maintainer: R4SAS <r4sas@i2pmail.org>
-Build-Depends: debhelper (>= 9), dpkg-dev (>= 1.16.1~), gcc (>= 4.7) | clang (>= 3.3), libboost-system-dev (>= 1.46), libboost-date-time-dev, libboost-filesystem-dev, libboost-program-options-dev, libminiupnpc-dev, libssl-dev
+Build-Depends: debhelper (>= 9), dpkg-dev (>= 1.16.1~), gcc (>= 4.7) | clang (>= 3.3), libboost-system-dev (>= 1.46), libboost-date-time-dev, libboost-filesystem-dev, libboost-program-options-dev, libminiupnpc-dev, libssl-dev, zlib1g-dev
 Standards-Version: 3.9.6
 Homepage: http://i2pd.website/
 Vcs-Git: git://github.com/PurpleI2P/i2pd.git