Failed to build package libpng while building mxe-octave natively

[Anirudha Bose]

I got this error while trying  to build libpng in MinGW. 

In file included from pngpriv.h:129:0,

                 from png.c:14:

pngstruct.h:27:18: fatal error: zlib.h: No such file or directory

compilation terminated.

make[2]: *** [libpng15_la-png.lo] Error 1

make[2]: Leaving directory `/home/ani/mxe-octave/tmp-libpng/libpng-1.5.13'

make[1]: *** [build-only-libpng] Error 2

make[1]: Leaving directory `/home/ani/mxe-octave'

I do have zlib installed on my system. Anyone else encountered this error?

- Anirudha