make  all-am
make[1]: Entering directory `/mingw/libpng-1.2.44'
/bin/sh ./libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.  -DPNG_CONFIGURE_LIBPNG    -g -O2 -MT libpng12_la-png.lo -MD -MP -MF .deps/libpng12_la-png.Tpo -c -o libpng12_la-png.lo `test -f 'png.c' || echo './'`png.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -DPNG_CONFIGURE_LIBPNG -g -O2 -MT libpng12_la-png.lo -MD -MP -MF .deps/libpng12_la-png.Tpo -c png.c  -DDLL_EXPORT -DPIC -o .libs/libpng12_la-png.o
In file included from png.c:17:
png.h:514:18: error: zlib.h: No such file or directory
In file included from png.h:518,
                 from png.c:17:
pngconf.h:1360: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*' token
pngconf.h:1361: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*' token
pngconf.h:1362: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*' token
In file included from png.c:17:
png.h:1270: error: expected specifier-qualifier-list before 'z_stream'
png.h:3141: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'png_zalloc'
png.h:3145: error: expected ')' before 'png_ptr'
png.c: In function 'png_set_sig_bytes':
png.c:109: error: 'png_struct' has no member named 'sig_bytes'
png.c: At top level:
png.c:158: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'png_zalloc'
png.c:202: error: expected ')' before 'png_ptr'
png.c: In function 'png_reset_crc':
png.c:213: error: 'png_struct' has no member named 'crc'
png.c:213: error: 'Z_NULL' undeclared (first use in this function)
png.c:213: error: (Each undeclared identifier is reported only once
png.c:213: error: for each function it appears in.)
png.c: In function 'png_calculate_crc':
png.c:226: error: 'png_struct' has no member named 'chunk_name'
png.c:239: error: 'png_struct' has no member named 'crc'
png.c:239: error: 'png_struct' has no member named 'crc'
png.c:239: error: 'uInt' undeclared (first use in this function)
png.c:239: error: expected ')' before 'length'
png.c: In function 'png_create_info_struct':
png.c:260: error: 'png_struct' has no member named 'malloc_fn'
png.c:260: error: 'png_struct' has no member named 'mem_ptr'
png.c: In function 'png_destroy_info_struct':
png.c:293: error: 'png_struct' has no member named 'free_fn'
png.c:294: error: 'png_struct' has no member named 'mem_ptr'
png.c: In function 'png_free_data':
png.c:508: error: 'png_struct' has no member named 'unknown_chunk'
png.c:510: error: 'png_struct' has no member named 'unknown_chunk'
png.c:511: error: 'png_struct' has no member named 'unknown_chunk'
png.c: In function 'png_info_destroy':
png.c:621: error: 'png_struct' has no member named 'num_chunk_list'
png.c:623: error: 'png_struct' has no member named 'chunk_list'
png.c:624: error: 'png_struct' has no member named 'chunk_list'
png.c:625: error: 'png_struct' has no member named 'num_chunk_list'
png.c: In function 'png_convert_to_rfc1123':
png.c:678: error: 'png_struct' has no member named 'time_buffer'
png.c:680: error: 'png_struct' has no member named 'time_buffer'
png.c:706: error: 'png_struct' has no member named 'time_buffer'
png.c:712: error: 'png_struct' has no member named 'time_buffer'
png.c: In function 'png_handle_as_unknown':
png.c:789: error: 'png_struct' has no member named 'num_chunk_list'
png.c:791: error: 'png_struct' has no member named 'chunk_list'
png.c:791: error: 'png_struct' has no member named 'num_chunk_list'
png.c:792: error: 'png_struct' has no member named 'num_chunk_list'
png.c: In function 'png_reset_zstream':
png.c:804: error: 'Z_STREAM_ERROR' undeclared (first use in this function)
png.c:805: error: 'png_struct' has no member named 'zstream'
png.c: In function 'png_check_IHDR':
png.c:981: error: 'png_struct' has no member named 'user_width_max'
png.c:991: error: 'png_struct' has no member named 'user_height_max'
png.c:1067: error: 'png_struct' has no member named 'mng_features_permitted'
png.c:1072: error: 'png_struct' has no member named 'mng_features_permitted'
make[1]: *** [libpng12_la-png.lo] Error 1
make[1]: Leaving directory `/mingw/libpng-1.2.44'
make: *** [all] Error 2