>>> Unpacking source...
>>> Unpacking libpng-1.2.26.tar.lzma to var/tmp/portage/media-libs/libpng-1.2.26-r1/work
unpack libpng-1.2.26.tar.lzma: file format not recognized. Ignoring.
/usr/portage/media-libs/libpng/libpng-1.2.26-r1.ebuild: line 22: cd: /var/tmp/portage/media-libs/libpng-1.2.26-r1/work/libpng-1.2.26: No such file or directory

* Applying libpng-1.2.24-pngconf-set jmp.patch ...
* Failed Patch: libpng-1.2.24-pngconf-set jmp.patch !
*  ( /usr/portage/media-libs/libpng/files/libpng-1.2.24-pngconf-set jmp.patch )
*
* Include in your bugreport the contents of :
*
*  /var/tmp/portage/media-libs/libpng-1.2.26-r1/temp/libpng-1.2.24-pngconf-set jmp.patch-1634.out
 
!!! ERROR: media-libs/libpng-1.2.26-r1 failed.
Call stack:
 ebuild.sh, line 1614:   Called dyn_unpack
 ebuild.sh, line 751:   Called qa_call 'src_unpack'
 environment, line 3395:   Called src_unpack
 libpng-1.2.26-r1.ebuild, line 23:   Called epatch '/usr/portage/media-libs/libpng/files/libpng-1.2.24-pngconf-set jmp.patch'
 eutils.eclass, line 324:   Called die
 
!!! Failed Patch: libpng-1.2.24-pngconf-set jmp.patch!
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/media-libs/libpng-1.2.26-r1/temp/build.log'.