homebrew してて imager::file::(jpeg|gif) を carton する時に symlink 貼ったの
imager::file::jpeg
/usr/include/jerror.h /usr/include/jmorecfg.h /usr/include/jconfig.h /usr/include/jpeglib.h /usr/lib/libjpeg.dylib
imager::file::gif
/usr/include/gif_lib.h /usr/lib/libgif.dylib
YappoLogs: homebrew libpng and Imager::File::PNG with Carton