Dungeon crawl stone soup libretro port

im having troubles compiling this: https://github.com/libretro/crawl-ref i also couldnt find an already compiled version of the core in buildbot. Im using prebuilt Git+MinGW toolchain and im using following commands to build it:

git submodule update --init
cd crawl-ref
make -f Makefile.libretro generate
make -f Makefile.libretro

with cloning the crawl-ref git-repository beforehand. It gives me an error on “generate” :

Ivan@DESKTOP-I9IP2GD /usr/crawl-ref/crawl-ref (master)
$ make -f Makefile.libretro generate
cd source && ./util/gen-mst.pl
cd source && ./util/art-data.pl
    Generating art-data.h
    Generating art-enum.h
    Generating dc-unrand.txt
    Generating tiledef-unrand.cc
cd source && ./util/gen-mi-enum
cd source && ./util/cmd-name.pl
cd source && ./util/gen-luatags.pl
cd source && ./util/gen_ver.pl build.h
cd  source && ./util/gen-cflg.pl compflag.h " -msse -msse2   -DTARGET_OS_WINDOWS -DFT2_BUILD_LIBRARY -DHAVE_FDATASYNC -D__LIBRETRO__  -DSQLITE_OMIT_LOAD_EXTENSION -DUSE_TILE -DUSE_TILE_LOCAL -DWIZARD  -DUSE_FT  -DPROPORTIONAL_FONT=\"DejaVuSans.ttf\"  -DMONOSPACED_FONT=\"DejaVuSansMono.ttf\"  -DUSE_FB -I./source/rltiles  -I./source/contrib/lua/src -I./source/contrib/pcre -I./source  -I./source/contrib/libpng -I./source/contrib/zlib  -I./source/contrib/freetype/include -I./source/contrib/sqlite  -I./libretro/libco -O3 -DNDEBUG -std=c++11" "-shared -static-libgcc  -static-libstdc++ -Wl,--version-script=libretro/link.T -lwinmm -lgdi32"  "libretro" "retro"
D:/GAMES/MinGW/mingw64/bin/make -C source/rltiles all TILES=1
make[1]: Entering directory 'D:/GAMES/MinGW/crawl-ref/crawl-ref/source/rltiles'
    HOSTCXX tool/tile_colour.o
tool/tile_colour.cc:7:18: fatal error: png.h: No such file or directory
  #include <png.h>
                  ^
compilation terminated.
Makefile:133: recipe for target 'tool/tile_colour.o' failed
make[1]: *** [tool/tile_colour.o] Error 1
make[1]: Leaving directory 'D:/GAMES/MinGW/crawl-ref/crawl-ref/source/rltiles'
Makefile.libretro:115: recipe for target 'generate' failed
make: *** [generate] Error 2

does anyone have an already complied crawl.libretro or maybe suggest something i should do to make it work?

Would love to get that game working on my Lakka box aswell.