diff --git a/CHANGELOG.md b/CHANGELOG.md
index 06889ad..2063c9c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 # Changelog
 All notable changes to this project will be documented here. This project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+- Added attribute to SInPacket to track decryption/decompression failures with incoming packets.
+
 ## 2.1.1 - 2018-03-14
 - Fixed getPeerCount() returning the maximum number of peers instead of the current peer count.
 - Fixed clients not sending disconnect message on program exit. 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2236f4b..cfc55a5 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,8 @@
 
 cmake_minimum_required(VERSION 3.10)
 
+option(OP_COMPILE_WITH_IRRLICHT "compile irrnet with native irrlicht datatypes" ON)
+
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
@@ -10,7 +12,6 @@ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/lib")
 set(LIBRARY_OUTPUT_DIRECTORY ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
 
 #irrnet stuff
-add_definitions(-DCOMPILE_WITH_IRRLICHT)
 set(IRRNET_TARGET irrnet)
 set(IRRNET_SRC_DIR "${CMAKE_CURRENT_LIST_DIR}/source")
 set(IRRNET_INC_DIR "${CMAKE_CURRENT_LIST_DIR}/include")
@@ -24,18 +25,38 @@ add_subdirectory(${ENET_DIR} EXCLUDE_FROM_ALL)
 #zlib stuff
 set(ZLIB_TARGET zlibstatic)
 set(ZLIB_DIR "${CMAKE_CURRENT_LIST_DIR}/zlib")
-set(ZLIB_INC_DIR ${ZLIB_DIR}/include)
+set(ZLIB_INC_DIR ${ZLIB_DIR})
+set(ZLIB_CONF_DIR ${CMAKE_CURRENT_BINARY_DIR}/zlib)
 add_subdirectory(${ZLIB_DIR} EXCLUDE_FROM_ALL)
 
+#irrlicht stuff
+if (NOT IRRLICHT_INC_DIR)
+	set(IRRLICHT_INC_DIR /usr/include/irrlicht)
+endif()
+
 
 project(irrnet)
 
-include_directories(/usr/include/irrlicht)
-
 add_library(${IRRNET_TARGET} STATIC
+    ${IRRNET_INC_DIR}/CEncryption.h
+    ${IRRNET_INC_DIR}/CNetManager.h
+    ${IRRNET_INC_DIR}/INetManager.h
+    ${IRRNET_INC_DIR}/irrNet.h
+    ${IRRNET_INC_DIR}/SPacket.h
     ${IRRNET_SRC_DIR}/CNetManager.cpp
     ${IRRNET_SRC_DIR}/SPacket.cpp
 )
 
-target_include_directories(${IRRNET_TARGET} PUBLIC ${IRRNET_INC_DIR} ${ENET_INC_DIR} ${ZLIB_INC_DIR})
+if (OP_COMPILE_WITH_IRRLICHT)
+    message(STATUS "compile with native irrlicht")
+    add_definitions(-DCOMPILE_WITH_IRRLICHT)
+	message(STATUS "irrlicht dir: " ${IRRLICHT_INC_DIR})
+    target_include_directories(${IRRNET_TARGET} PUBLIC ${IRRLICHT_INC_DIR})
+endif()
+
+target_link_libraries(${IRRNET_TARGET} ${ZLIB_TARGET} ${ENET_TARGET})
+
+target_include_directories(${IRRNET_TARGET} PUBLIC ${IRRNET_INC_DIR} ${ENET_INC_DIR} ${ZLIB_INC_DIR})
+message(STATUS "conf dir" ${ZLIB_CONF_DIR})
+target_include_directories(${IRRNET_TARGET} PRIVATE ${ZLIB_CONF_DIR})
 
diff --git a/include/SPacket.h b/include/SPacket.h
index ec213ee..303c0a3 100644
--- a/include/SPacket.h
+++ b/include/SPacket.h
@@ -49,8 +49,10 @@ class SOutPacket
 		SOutPacket& operator << (const f64 data);
 		/// Adds data to the packet.
 		SOutPacket& operator << (const core::vector3df& data);
+#ifdef COMPILE_WITH_IRRLICHT
         /// Adds a quaternion to the packet
         SOutPacket& operator << (const core::quaternion&);
+#endif
 		/// Adds data to the packet.
 		SOutPacket& operator << (const c8* string);
 		/// Adds data to the packet.
@@ -116,8 +118,10 @@ class SInPacket
 		void operator >> (f64& data);
 		/// Gets the next item in the packet based on the size of the variable.
         void operator >> (core::vector3df& data);
+#ifdef COMPILE_WITH_IRRLICHT
         /// Gets the next item in the packet based on the size of the variable.
         void operator >> (core::quaternion& data);
+#endif
 		/// Gets the next item in the packet based on the size of the variable.
 		void operator >> (char* string);
 		/// Gets the next item in the packet based on the size of the variable.
@@ -157,10 +161,14 @@ class SInPacket
 		/// Returns the size in bytes of the packet.
 		u32 getSize(); 
 
+		/// Returns true if the packet decompresses/decrypts successfully.
+		bool isValid();
+
 	private:
 		u32 pos;
 		core::array<c8> buff;
 		u16 playerid;
+		bool valid;
 };
 
 } // Close Net Namespace
diff --git a/source/SPacket.cpp b/source/SPacket.cpp
index bbb04b3..83ebd64 100644
--- a/source/SPacket.cpp
+++ b/source/SPacket.cpp
@@ -106,13 +106,14 @@ SOutPacket& SOutPacket::operator << (const core::vector3df& data)
 	memcpy(buff.pointer() + buff.size() - 12, &data.X, 12);
 	return *this;
 }
-
+#ifdef COMPILE_WITH_IRRLICHT
 SOutPacket& SOutPacket::operator << (const core::quaternion& data)
 {
     enlargeBuffer(16);
     memcpy(buff.pointer() + buff.size() - 16, &data.X, 16);
     return *this;
 }
+#endif
 
 SOutPacket& SOutPacket::operator << (const c8* string)
 {
@@ -232,7 +233,7 @@ void SOutPacket::decryptPacket(const c8 key[16])
 	buff = tmpbuff;
 }
 
-SInPacket::SInPacket(const c8* buff, const u32 size) : pos(0), playerid(0)
+SInPacket::SInPacket(const c8* buff, const u32 size) : pos(0), playerid(0), valid(true)
 {
 	SInPacket::buff.set_used(size);
 	memcpy(SInPacket::buff.pointer(), buff, size);
@@ -304,12 +305,13 @@ void SInPacket::operator >> (core::vector3df &data)
 	memcpy(&data.X,getData()+pos,12);
 	pos+=12;
 }
-
+#ifdef COMPILE_WITH_IRRLICHT
 void SInPacket::operator >> (core::quaternion &data)
 {
     memcpy(&data.X,getData()+pos,16);
     pos+=16;
 }
+#endif
 
 void SInPacket::operator >> (char *string)
 {
@@ -448,10 +450,19 @@ void SInPacket::deCompressPacket()
 	newBuff.set_used(newSize);
 
 	uLongf destLen = newSize;
-	uncompress((Bytef*)newBuff.pointer(), &destLen, (Bytef*)buff.pointer() + 4, buff.size() - 4);
-	newBuff.set_used(destLen);
-
-	buff = newBuff;
+	int ret = uncompress((Bytef*)newBuff.pointer(), &destLen, (Bytef*)buff.pointer() + 4, buff.size() - 4);
+	
+	if (ret != Z_OK)
+	{
+		valid = false;
+		newBuff.set_used(0);
+		newBuff.clear();
+	}
+	else
+	{
+		newBuff.set_used(destLen);
+		buff = newBuff;
+	}
 }
 
 void SInPacket::encryptPacket(const c8 key[16])
@@ -470,6 +481,12 @@ void SInPacket::encryptPacket(const c8 key[16])
 
 void SInPacket::decryptPacket(const c8 key[16])
 {
+	if (buff.size() % 16 != 0)
+	{
+		valid = false;
+		return;
+	}
+
 	CEncryption::SetEncryptionKey((u8*)&key[0]);
 	const u32 newSize = buff.size();
 	core::array<c8> tmpbuff;
@@ -486,5 +503,10 @@ u32 SInPacket::getSize()
 	return buff.size();
 }
 
+bool SInPacket::isValid()
+{
+	return valid;
+}
+
 } // Close Net Namespace
 } // Close Irr namespace