pngLoad.cc: In function 'int pngLoad(char*, long unsigned int**, long unsigned int**, char**)':
pngLoad.cc:130: error: invalid conversion from 'unsigned char*' to 'char*'
pngLoad.cc:145: warning: comparison between signed and unsigned integer expressions
pngLoad.cc:146: error: invalid conversion from 'char*' to 'png_byte*'
make: *** [pngLoad.o] Error 1
make: Target `first' not remade because of errors.

I fixed these by changing the typecast from (unsigned char*) to just (char *). And adding a typecast (png_byte*) on line 146.

But I wonder why this code would work for some people? I suppose it must be a different compiler?

I'm using:
i686-apple-darwin8-gcc-4.0.1

Thanks.