AfterStep @2.2.11 build failure: incomplete definition of type 'struct png_struct_def'

[eisGeist]

I entered the command to install afterstep:

    sudo port install afterstep

after a few attempt to fetch the files

--->  ...
--->  Attempting to fetch AfterStep-2.2.11_0.darwin_19.x86_64.tbz2 from http://fco.it.packages.macports.org/AfterStep
--->  Building AfterStep

The built was started and ended with an error:

Error: Failed to build AfterStep: command execution failed
Error: See /opt/local/var/macports/...
Error: Follow https://guide.macports...
Error: Failed to build AfterStep: command execution failed

I tried to build it twice and had the same error both times.

[eisGeist]

Build log with errors

[jmroot (Joshua Root)]

The error is

:info:build export.c:499:22: error: incomplete definition of type 'struct png_struct_def'
:info:build                         if( setjmp(png_ptr->jmpbuf) )
:info:build                                    ~~~~~~~^
:info:build /opt/local/include/libpng16/png.h:439:16: note: forward declaration of 'struct png_struct_def'
:info:build typedef struct png_struct_def png_struct;
:info:build                ^

[ryandesign (Ryan Carsten Schmidt)]

In b0a87db6772dabb9acc5047edda65ec269219758/macports-ports (master):

AfterStep: Fix build with libpng 1.5 and later

Closes: #60538