Two versions of libpng showing in convert -list format

[fmw42]

I have two versions of libpng showing in IM 6.9.9.0 Q16 Mac OSX. Delegates installed via Macports and IM installed from source.

convert -list format

PNG* PNG rw- Portable Network Graphics (libpng 1.6.29,1.6.30)

Not sure why listing is showing two versions. MacPorts only has one listed as active.

libpng @1.6.29_0
libpng @1.6.30_0 (active)

Is this a new bug and what are the ramifications?

[glennrp]

The first is the version of png.h that was used while building ImageMagick, and the second is the version of libpng that is actually being used at run time. 1.6.29 and 1.6.30 happen to be compatible, so it's not a problem. It's not an ImageMagick bug.

There *would* be a problem if it showed incompatible versions such as (1.6.29, 1.2.54); "convert" would likely crash when it encountered a PNG file.

[fmw42]

Thanks Glenn