[libpng16] Imported from libpng-1.6.19rc02.tar

[libpng15] Imported from libpng-1.5.24rc01.tar

 [libpng14] Imported from libpng-1.4.17rc02.tar

[libpng12] Imported from libpng-1.2.54rc02.tar

 [libpng14] Imported from libpng-1.4.17rc01.tar

[libpng12] Imported from libpng-1.2.54rc01.tar

[libpng16] Imported from libpng-1.6.19rc01.tar

 [libpng14] Imported from libpng-1.4.17beta03.tar

[libpng12] Imported from libpng-1.2.54beta01.tar

[libpng16] Imported from libpng-1.6.19beta04.tar