problems trying to compile libpng-1.5.28

[Jack Ostroff]

I've been struggling with this for a while now.  During the compile 
phase, I get the following errors:

------------------

[14/29] Building C object CMakeFiles/png.dir/pngread.c.obj
FAILED: CMakeFiles/png.dir/pngread.c.obj
R:\mingw\bin\gcc.exe  -DPNG_BUILD_DLL -IR:/include -I. 
-IR:/build/win32libs/libpng/work/libpng-1.5.28 -O2 -g -DNDEBUG -MD -MT 
CMakeFiles/png.dir/pngread.c.obj -MF CMakeFiles\png.dir\pngread.c.obj.d 
-o CMakeFiles/png
.dir/pngread.c.obj   -c 
R:\build\win32libs\libpng\work\libpng-1.5.28\pngread.c
R:\build\win32libs\libpng\work\libpng-1.5.28\pngread.c: In function 
'png_create_read_struct_2':

R:\build\win32libs\libpng\work\libpng-1.5.28\pngread.c:67:30: error: 
'PNG_USER_WIDTH_MAX' undeclared (first use in this function)

     png_ptr->user_width_max = PNG_USER_WIDTH_MAX;

                               ^

R:\build\win32libs\libpng\work\libpng-1.5.28\pngread.c:67:30: note: each 
undeclared identifier is reported only once for each function it appears in

R:\build\win32libs\libpng\work\libpng-1.5.28\pngread.c:68:31: error: 
'PNG_USER_HEIGHT_MAX' undeclared (first use in this function)

     png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;

                                ^

R:\build\win32libs\libpng\work\libpng-1.5.28\pngread.c:71:36: error: 
'PNG_USER_CHUNK_CACHE_MAX' undeclared (first use in this function)

     png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX;

                                     ^

R:\build\win32libs\libpng\work\libpng-1.5.28\pngread.c:74:37: error: 
'PNG_USER_CHUNK_MALLOC_MAX' undeclared (first use in this function)

     png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX;

                                      ^

[15/29] Building C object CMakeFiles/png.dir/pngmem.c.obj
[16/29] Building C object CMakeFiles/png.dir/pngpread.c.obj

------------------

The source file pngusr.dfa implies that changing the last few lines in 
that file will set those variables - but it appears something other than 
just editing that file is necessary.  I cannot tell if it requires 
moving one or more files up from the scripts directory, or running 
autogen.sh in the source directory - which I can't figure out how to do 
anyway.

I would have expected some default values to have been set, but it 
appears not.  I may try to  bring this up separately with the libpng 
developers, and I'll report back if I get anywhere with that.

Thanks for any other suggestions.


Jack