diff --git a/jni/jni/build-windows64.xml b/jni/jni/build-windows64.xml
new file mode 100644
index 00000000..f26cd7c5
--- /dev/null
+++ b/jni/jni/build-windows64.xml
@@ -0,0 +1,203 @@
+<project name="vtm-jni-Windows-64" basedir="." default="postcompile">
+	
+	<!-- include the environment -->
+	<property environment="env"/>	
+	
+	<!-- output directory for temporary object files -->
+	<property name="buildDir" value="target/windows64" />
+	
+	<!-- output directory for the shared library -->
+	<property name="libsDir" value="../libs/windows64" />
+	
+	<!-- the name of the shared library -->
+	<property name="libName" value="vtm-jni64.dll"/>
+	
+	<!-- the jni header jniPlatform to use -->
+	<property name="jniPlatform" value="win32"/>
+	
+	<!-- the compiler to use when compiling c files -->
+	<property name="cCompiler" value="gcc"/>
+	
+	<!-- the compiler to use when compiling c++ files -->
+	<property name="cppCompiler" value="g++"/>
+	
+	<!-- the command to use when archiving files -->
+	<property name="archiver" value="ar"/>
+	
+	<!-- the compilerPrefix for the C & C++ compilers -->
+	<property name="compilerPrefix" value="x86_64-w64-mingw32-"/>
+	
+	<!-- the compilerSuffix for the C & C++ compilers -->
+	<property name="compilerSuffix" value=".exe" />
+	
+	<!-- define gcc compiler, options and files to compile -->
+	<property name="gcc" value="${compilerPrefix}${cCompiler}${compilerSuffix}"/>	
+	<property name="gcc-opts" value="-c -Wall -O2 -mfpmath=sse -msse2 -fmessage-length=0 -m64 -Wall -std=c99 -O2 -ffast-math -DNDEBUG"/>
+	<fileset id="gcc-files" dir="./">
+		<exclude name="target/"/>		
+		<include name="memcpy_wrap.c"/>
+		<include name="gl/utils.c"/>
+		<include name="libtess2/Source/bucketalloc.c"/>
+		<include name="libtess2/Source/dict.c"/>
+		<include name="libtess2/Source/geom.c"/>
+		<include name="libtess2/Source/mesh.c"/>
+		<include name="libtess2/Source/priorityq.c"/>
+		<include name="libtess2/Source/sweep.c"/>
+		<include name="libtess2/Source/tess.c"/>
+	</fileset>
+	
+	<!-- define g++ compiler, options and files to compile -->
+	<property name="g++" value="${compilerPrefix}${cppCompiler}${compilerSuffix}"/>
+	<property name="g++-opts" value="-c -Wall -O2 -mfpmath=sse -msse2 -fmessage-length=0 -m64 -Wall -std=c99 -O2 -ffast-math -DNDEBUG -fpermissive"/>
+	<fileset id="g++-files" dir="./">
+		<exclude name="target/"/>
+		<include name="**/*.cpp"/>
+	</fileset>
+
+	<!-- define linker and options -->
+	<property name="linker" value="${compilerPrefix}${cppCompiler}${compilerSuffix}"/>
+	<property name="linker-opts" value="-Wl,--kill-at -shared -static -static-libgcc -static-libstdc++ -m64"/>
+	<property name="libraries" value=""/>
+
+	<!-- define stripper -->
+	<property name="stripper" value="${compilerPrefix}strip${compilerSuffix}"/>
+	
+	<!-- cleans the build directory, removes all object files and shared libs -->
+	<target name="clean">
+		<delete includeemptydirs="true" quiet="true">
+			<fileset dir="${buildDir}"/>
+			<fileset dir="${libsDir}" includes="**/*"/>
+		</delete>
+	</target>
+	
+	<target name="precompile" depends="clean">
+		<condition property="compiler-found">
+			<and>
+				<or>
+					<!-- Include both b/c Windows might be either -->
+					<available file="${g++}" filepath="${env.PATH}"/>
+					<available file="${g++}" filepath="${env.Path}"/>
+				</or>
+				<or>
+					<!-- Include both b/c Windows might be either -->
+					<available file="${gcc}" filepath="${env.PATH}"/>
+					<available file="${gcc}" filepath="${env.Path}"/>
+				</or>
+			</and>
+		</condition>
+		<condition property="has-compiler">
+			<equals arg1="${compiler-found}" arg2="true"/>
+		</condition>
+		<condition property="stripper-found">
+			<or>
+				<!-- Include both b/c Windows might be either -->
+				<available file="${stripper}" filepath="${env.PATH}"/>
+				<available file="${stripper}" filepath="${env.Path}"/>
+			</or>
+		</condition>
+		<condition property="should-strip">
+			<and>
+				<equals arg1="${stripper-found}" arg2="true"/>
+				<equals arg1="${release}" arg2="true"/>
+				<!-- Don't strip mac osx libs -->
+				<not>
+					<contains string="${libName}" substring="dylib"/>
+				</not>
+			</and>
+		</condition>
+		
+	</target>
+	
+	<target name="create-build-dir" depends="precompile" if="has-compiler">
+		<!-- FIXME this is pretty nasty :/ -->
+		<copy todir="${buildDir}">
+			<fileset refid="g++-files"/>
+			<fileset refid="gcc-files"/>
+		</copy>
+		<delete>
+			<fileset dir="${buildDir}">
+				<include name="*"/>
+				<exclude name="*.o"/>
+			</fileset>
+		</delete>
+	</target>
+
+	<!-- compiles all C and C++ files to object files in the build directory -->
+	<target name="compile" depends="create-build-dir" if="has-compiler">
+		<mkdir dir="${buildDir}"/>
+		<apply failonerror="true" executable="${g++}" dest="${buildDir}" verbose="true">
+			<arg line="${g++-opts}"/>
+			<arg value="-Ijni-headers"/>
+			<arg value="-Ijni-headers/${jniPlatform}"/>
+			<arg value="-I."/>
+						<arg value="-I."/>
+			<arg value="-Ilibtess2/Include"/>
+
+			<srcfile/>
+			<arg value="-o"/>
+			<targetfile/>
+			<fileset refid="g++-files"/>
+			<compositemapper>
+				<mapper type="glob" from="*.cpp" to="*.o"/>
+				<mapper type="glob" from="*.mm" to="*.o"/>
+			</compositemapper>
+		</apply>
+		<apply failonerror="true" executable="${gcc}" dest="${buildDir}" verbose="true">
+			<arg line="${gcc-opts}"/>
+			<arg value="-Ijni-headers"/>
+			<arg value="-Ijni-headers/${jniPlatform}"/>
+			<arg value="-I."/>
+						<arg value="-I."/>
+			<arg value="-Ilibtess2/Include"/>
+			<arg value="-Ilibtess2/Source"/>
+
+			<srcfile/>
+			<arg value="-o"/>
+			<targetfile/>
+			<fileset refid="gcc-files"/>
+			<compositemapper>
+				<mapper type="glob" from="*.c" to="*.o"/>
+				<mapper type="glob" from="*.m" to="*.o"/>
+			</compositemapper>
+		</apply>
+	</target>	
+
+	<!-- links the shared library based on the previously compiled object files -->	
+	<target name="link" depends="compile" if="has-compiler">
+		<fileset dir="${buildDir}" id="objFileSet">
+			<patternset>
+				<include name="**/*.o" />
+			</patternset>
+		</fileset>
+		<pathconvert pathsep=" " property="objFiles" refid="objFileSet" />
+		<mkdir dir="${libsDir}" />
+		<exec executable="${linker}" failonerror="true" dir="${buildDir}">
+			<arg line="${linker-opts}" />
+			<arg value="-o" />
+			<arg path="${libsDir}/${libName}" />
+			<arg line="${objFiles}"/>
+			<arg line="${libraries}" />
+		</exec>
+	</target>	
+
+	<!-- strips the shared library of debug symbols -->
+	<target name="strip" depends="link" if="should-strip">
+		<exec executable="${stripper}" failonerror="true" dir="${buildDir}">
+			<arg value="--strip-unneeded"/>
+			<arg path="${libsDir}/${libName}" />
+		</exec>
+	</target>
+	
+	<!-- copy dll into dev environment 
+	<target name="copyDLL" depends="link">
+		<copy 
+			file	="${libsDir}/${libName}" 
+			todir	="C:/DAT/MT/mytourbook/bundles/net.tourbook.ext.vtm.windows/natives"
+		/>
+	</target>
+	-->
+
+	<target name="postcompile" depends="strip">
+		
+	</target>
+</project>
diff --git a/jni/jni/gl/utils.c b/jni/jni/gl/utils.c
index 67b6b7e9..31609d46 100644
--- a/jni/jni/gl/utils.c
+++ b/jni/jni/gl/utils.c
@@ -102,7 +102,7 @@ matrix4_proj2D(float* mat, float* vec, float *out);
 
 jlong JNI(alloc)(JNIEnv *env, jclass* clazz)
 {
-  return (long) calloc(16, sizeof(float));
+  return (jlong) calloc(16, sizeof(float));
 }
 
 jobject JNI(getBuffer)(JNIEnv *env, jclass* clazz,jlong ptr){
diff --git a/jni/jni/org.oscim.utils.TessJNI.cpp b/jni/jni/org.oscim.utils.TessJNI.cpp
index ce73df4b..98c1fcf2 100644
--- a/jni/jni/org.oscim.utils.TessJNI.cpp
+++ b/jni/jni/org.oscim.utils.TessJNI.cpp
@@ -23,7 +23,7 @@
 //@line:131
  {
 		if (size <= 0)
-		   return (long)tessNewTess(0);
+		   return (jlong)tessNewTess(0);
 		if (size > 10)
 			size = 10;
 		TESSalloc ma;
@@ -39,7 +39,7 @@
 		ma.regionBucketSize = 1 << size;	 // 256
 		ma.extraVertices = 8;
 	    //ma.extraVertices = 256;
-	    return (long)tessNewTess(&ma);
+	    return (jlong)tessNewTess(&ma);
 	} 
 
 }
diff --git a/vtm-desktop/natives/windows/vtm-jni64.dll b/vtm-desktop/natives/windows/vtm-jni64.dll
index b19928bd..b926665f 100644
Binary files a/vtm-desktop/natives/windows/vtm-jni64.dll and b/vtm-desktop/natives/windows/vtm-jni64.dll differ