[Debian-med-packaging] Bug#650570:

[Mathieu Malaterre]

Some notes on why this is failing:

$ cat png.h
...
/* The complete definition of png_info has, as of libpng-1.5.0, * been
moved into a separate header file that is not accessible to *
applications.  Read libpng-manual.txt or libpng.3 for more info.
*/typedef struct png_info_def png_info;