boswars did not compile

[mschaaf@…]

:debug:main org.macports.load registered provides 'load', a pre-existing procedure. Target override will not be provided :debug:main org.macports.unload registered provides 'unload', a pre-existing procedure. Target override will not be provided :debug:main org.macports.distfiles registered provides 'distfiles', a pre-existing procedure. Target override will not be provided :debug:main Using group file /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/group/select-1.0.tcl :debug:main Reading variant descriptions from /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/_resources/port1.0/variant_descriptions.conf <r/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_games_boswars/boswars/main.log" [readonly] 611L, 49969C :info:build engine/video/png.cpp:239: error: invalid use of incomplete type 'struct png_info_def' :info:build /opt/local/include/png.h:733: error: forward declaration of 'struct png_info_def' :info:build engine/video/png.cpp:285: error: invalid use of incomplete type 'struct png_info_def' :info:build /opt/local/include/png.h:733: error: forward declaration of 'struct png_info_def' :info:build engine/video/png.cpp:286: error: invalid use of incomplete type 'struct png_info_def' :info:build /opt/local/include/png.h:733: error: forward declaration of 'struct png_info_def' :info:build engine/video/png.cpp:287: error: invalid use of incomplete type 'struct png_info_def' :info:build /opt/local/include/png.h:733: error: forward declaration of 'struct png_info_def' :info:build engine/video/png.cpp:288: error: invalid use of incomplete type 'struct png_info_def' :info:build /opt/local/include/png.h:733: error: forward declaration of 'struct png_info_def' :info:build engine/video/png.cpp:289: error: invalid use of incomplete type 'struct png_info_def' :info:build /opt/local/include/png.h:733: error: forward declaration of 'struct png_info_def' :info:build engine/video/png.cpp:290: error: invalid use of incomplete type 'struct png_info_def' :info:build /opt/local/include/png.h:733: error: forward declaration of 'struct png_info_def' :info:build engine/video/png.cpp: In function 'void SaveScreenshotPNG(const std::string&)': :info:build engine/video/png.cpp:343: error: invalid use of incomplete type 'struct png_struct_def' :info:build /opt/local/include/png.h:860: error: forward declaration of 'struct png_struct_def' :info:build scons: * [build/debug/video/png.o] Error 1 :info:build scons: building terminated because of errors. :info:build Command failed: /opt/local/bin/scons debug :info:build Exit code: 2 :error:build org.macports.build for port boswars returned: command execution failed :debug:build Error code: NONE :debug:build Backtrace: command execution failed

while executing

"$procedure $targetname" :info:build Warning: targets not executed for boswars: org.macports.activate org.macports.build org.macports.destroot org.macports.install :notice:build Please see the log file for port boswars for details:

/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_games_boswars/boswars/main.log