compile libpng library

Install well zlib Behind the library , Proceed again libpng The installation of the library .

cd libpng-1.6.37
export LDFLAGS="-L/home/book/mytest/zlib-1.2.11"
export CPPFLAGS="-L/home/book/mytest/zlib-1.2.11"
./configure --host=arm-linux-gnueabihf --prefix=$PWD/tmp
makesudo make install