4.0.0 org.pngquant libimagequant jar 2.1.1 pngquant http://pngquant.org . org.codehaus.mojo exec-maven-plugin 1.1 build compile exec make -j8 USE_SSE=1 java clean clean exec make clean mac-x64 Mac x64 org.pngquant libimagequant-jni 1 jnilib mac-x64 linux-x64 unix Linux x64 org.pngquant libimagequant-jni so 1 linux-x64