libpng源码编译安装

源码下载地址：https://sourceforge.net/projects/libpng/files/
注意不同平台下载不同的包

These two files contain the source and supporting files
    with LF line endings (for Unix/Linux) with the "configure"
    script.  Both have identical content.
    
       libpng-<version>.tar.xz (LZMA-compressed, recommended)
       libpng-<version>.tar.gz
    
These two files contain the source and supporting files
    with CRLF line endings (for Windows), without the "configure"
    script.  Both have identical content.
    
       lp<version>.7z (LZMA-compressed, recommended)
       lp<version>.zip

# Linux 下编译安装
./configure --prefix=$HOME/workspace/libpng/libpng/output
make -j
make install