Install png package in macOsX

1- install Xcode from app store (take care, it is 4 GB !)
2- Open Xcode from application folder and install line command tools
3- Open terminal and enter: sudo xcodebuild -license
4- Go to the end and enter agree
5- Install macport https://www.macports.org (it is simpler to use the .pkg file) or/and update it using:
6- In terminal enter: sudo port upgrade outdated
7- Enter in terminal: sudo port install libpng
8- In R, enter: install.packages(pkgs="http://www.rforge.net/src/contrib/png_0.1-8.tar.gz", repos=NULL)

Done

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