gtk2 does not build, libpng does exist, put loader does not recognize apple-red.png

[mvondavier@…]

Port command started with PID 18603
Computing dependencies for gtk2
Fetching gtk2
Attempting to fetch gtk+-2.24.4.tar.bz2 from ftp://ftp.cse.buffalo.edu/pub/Gnome/sources/gtk+/2.24/
Verifying checksum(s) for gtk2
Extracting gtk2
Applying patches to gtk2
Configuring gtk2
Building gtk2
Error: Target org.macports.build returned: shell command failed (see log for details)
Log for gtk2 is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_gnome_gtk2/main.log
Error: Status 1 encountered during processing.
To report a bug, see <http://guide.macports.org/#project.tickets>
Executing: /opt/local/bin/port install gtk2 +x11

from the log:

:info:build Making all in demos
:info:build /opt/local/bin/gdk-pixbuf-csource --raw --build-list		\
:info:build 	        apple_red  ./apple-red.png	\
:info:build                 gnome_foot ./gnome-foot.png	\
:info:build         > test-inline-pixbufs.h				\
:info:build 	|| (rm -f test-inline-pixbufs.h && false)
:info:build failed to load "./apple-red.png": Couldn't recognize the image file format for file './apple-red.png'
:info:build make[2]: *** [test-inline-pixbufs.h] Error 1
:info:build make[1]: *** [all-recursive] Error 1
:info:build make: *** [all] Error 2
:info:build shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_gnome_gtk2/work/gtk+-2.24.4" && /usr/bin/make all " returned error 2
:error:build Target org.macports.build returned: shell command failed (see log for details)
:debug:build Backtrace: shell command failed (see log for details)
    while executing
"command_exec build"
    (procedure "portbuild::build_main" line 8)
    invoked from within
"$procedure $targetname"
:info:build Warning: the following items did not execute (for gtk2): org.macports.activate org.macports.build org.macports.destroot org.macports.install
:notice:build Log for gtk2 is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_gnome_gtk2/main.log

[ryandesign (Ryan Carsten Schmidt)]

What computer, what OS version, and what version of Xcode?

Can you attach the complete main.log file?