Fox Tool kit installing issue

I am attempting to install the fox tool kit on my Ubuntu 23.04 operating 
system. However, I encountered some errors after building it. I also 
attempted to install libpng, but encountered the same problems.

fxpngio.cpp:78:18: error: invalid use of incomplete type 'png_struct' 
{aka 'struct png_struct_def'}
         78 | longjmp(png_ptr->jmpbuf,1);                           // 
Bail out
              |                  ^~
In file included from fxpngio.cpp:29:
/usr/include/png.h:439:16: note: forward declaration of 'png_struct' 
{aka 'struct png_struct_def'}

         439 | typedef struct png_struct_def png_struct;
                |                ^~~~~~~~~~~~~~
In file included from /usr/include/pngconf.h:51,
                            from /usr/include/png.h:335:
fxpngio.cpp: In function 'bool FX::fxloadPNG(FXStream&, FXColor*&, 
FXint&, FXint&)':
fxpngio.cpp:121:20: error: invalid use of incomplete type 'png_struct' 
{aka 'struct png_struct_def'}

         121 | if(setjmp(png_ptr->jmpbuf)){
                 |                    ^~

/usr/include/png.h:439:16: note: forward declaration of 'png_struct' 
{aka 'struct png_struct_def'}
         439 | typedef struct png_struct_def png_struct;
                |                ^~~~~~~~~~~~~~
fxpngio.cpp: In function 'bool FX::fxsavePNG(FXStream&, const FXColor*, 
FXint, FXint)':
fxpngio.cpp:234:20: error: invalid use of incomplete type 'png_struct' 
{aka 'struct png_struct_def'}

         234 | if(setjmp(png_ptr->jmpbuf)){
                |                    ^~
/usr/include/png.h:439:16: note: forward declaration of 'png_struct' 
{aka 'struct png_struct_def'}
         439 | typedef struct png_struct_def png_struct;
                |                ^~~~~~~~~~~~~~
make[1]: *** [Makefile:745: fxpngio.lo] Error 1
make[1]: Leaving directory '/home/sn/temp/fox-1.6.8/src'
make: *** [Makefile:203: install-recursive] Error 1

-- 
Soubheek Nath
Fifth Estate
[email protected]



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