Created attachment 344534 [details] build.log fails to build against libpng 1.6.1, see build.log
fixed in 1.8.3 + 08 Apr 2013; Samuli Suominen <ssuominen@gentoo.org> pngquant-1.8.3.ebuild, + +files/pngquant-1.8.3-libpng16.patch: + Prevent conflict with libpng16 by renaming png_image with rwpng_png_image in + rwpng.c and rwpng.h wrt #464762
reported here: https://github.com/pornel/improved-pngquant/issues/31