[AL] Building loadpng from all4310.zip

[Davin P. <dav...@gm...>]

Running the following command:

D:\allegro-4.3.10\addons\loadpng>mingw32-make

generates the following error messages:
-
Compiling loadpng library...
gcc -W -Wall -O3 -I. -I../../include -o loadpng.o -c loadpng.c
loadpng.c:8:17: png.h: No such file or directory
loadpng.c:22: `Z_BEST_COMPRESSION' undeclared here (not in a function)
loadpng.c:49: parse error before "png_ptr"
loadpng.c: In function `read_data':
loadpng.c:51: warning: implicit declaration of function `png_get_io_ptr'
loadpng.c:51: `png_ptr' undeclared (first use in this function)
loadpng.c:51: (Each undeclared identifier is reported only once
loadpng.c:51: for each function it appears in.)
loadpng.c:52: `png_uint_32' undeclared (first use in this function)
loadpng.c:52: parse error before "pack_fread"
loadpng.c:51: warning: unused variable `f'
loadpng.c: In function `check_if_png':
loadpng.c:72: warning: implicit declaration of function `png_sig_cmp'
loadpng.c:72: `png_size_t' undeclared (first use in this function)
loadpng.c:72: parse error before numeric constant
loadpng.c:72: parse error before ')' token
loadpng.c: At top level:
loadpng.c:80: parse error before "png_ptr"
loadpng.c: In function `really_load_png':
loadpng.c:84: `png_uint_32' undeclared (first use in this function)
loadpng.c:84: parse error before "width"
loadpng.c:97: warning: implicit declaration of function `png_read_info'
loadpng.c:97: `png_ptr' undeclared (first use in this function)
loadpng.c:97: `info_ptr' undeclared (first use in this function)
loadpng.c:99: warning: implicit declaration of function `png_get_IHDR'
loadpng.c:99: `width' undeclared (first use in this function)
loadpng.c:99: `height' undeclared (first use in this function)
loadpng.c:105: warning: implicit declaration of function `png_set_packing'
loadpng.c:108: `PNG_COLOR_TYPE_GRAY' undeclared (first use in this function)
loadpng.c:109: warning: implicit declaration of function `png_set_expand'
loadpng.c:113: warning: implicit declaration of function `png_get_valid'
loadpng.c:113: `PNG_INFO_tRNS' undeclared (first use in this function)
loadpng.c:114: warning: implicit declaration of function `png_set_tRNS_to_alp

loadpng.c:120: warning: implicit declaration of function `png_set_strip_16'
loadpng.c:124: `PNG_COLOR_TYPE_GRAY_ALPHA' undeclared (first use in this func
n)
loadpng.c:125: warning: implicit declaration of function `png_set_gray_to_rgb
loadpng.c:131: warning: implicit declaration of function `png_get_sRGB'
loadpng.c:132: warning: implicit declaration of function `png_set_gamma'
loadpng.c:134: warning: implicit declaration of function `png_get_gAMA'
loadpng.c:142: warning: implicit declaration of function `png_set_interlace_h
ling'
loadpng.c:147: warning: implicit declaration of function `png_read_update_inf
loadpng.c:152: `pal' undeclared (first use in this function)
loadpng.c:156: `PNG_COLOR_MASK_PALETTE' undeclared (first use in this functio
loadpng.c:158: `png_colorp' undeclared (first use in this function)
loadpng.c:158: parse error before "palette"
loadpng.c:160: warning: implicit declaration of function `png_get_PLTE'
loadpng.c:160: `palette' undeclared (first use in this function)
loadpng.c:176: `rowbytes' undeclared (first use in this function)
loadpng.c:176: warning: implicit declaration of function `png_get_rowbytes'
loadpng.c:193: warning: implicit declaration of function `png_set_bgr'
loadpng.c:201: parse error before "y"
loadpng.c:202: `y' undeclared (first use in this function)
loadpng.c:203: warning: implicit declaration of function `png_read_row'
loadpng.c:211: warning: implicit declaration of function `png_read_end'
loadpng.c: In function `load_png_pf':
loadpng.c:247: `png_structp' undeclared (first use in this function)
loadpng.c:247: parse error before "png_ptr"
loadpng.c:248: `png_infop' undeclared (first use in this function)
loadpng.c:262: `png_ptr' undeclared (first use in this function)
loadpng.c:262: warning: implicit declaration of function `png_create_read_str
'
loadpng.c:262: `PNG_LIBPNG_VER_STRING' undeclared (first use in this function
loadpng.c:269: `info_ptr' undeclared (first use in this function)
loadpng.c:269: warning: implicit declaration of function `png_create_info_str
'
loadpng.c:271: warning: implicit declaration of function `png_destroy_read_st
t'
loadpng.c:271: `png_infopp' undeclared (first use in this function)
loadpng.c:279: warning: implicit declaration of function `setjmp'
loadpng.c:287: warning: implicit declaration of function `png_set_read_fn'
loadpng.c:287: `png_rw_ptr' undeclared (first use in this function)
loadpng.c:287: parse error before "read_data"
loadpng.c:290: warning: implicit declaration of function `png_set_sig_bytes'
loadpng.c: At top level:
loadpng.c:309: parse error before "png_uint_32"
loadpng.c:309: warning: no semicolon at end of struct or union
loadpng.c:310: warning: type defaults to `int' in declaration of `current_pos
loadpng.c:310: warning: data definition has no type or storage class
loadpng.c:311: warning: type defaults to `int' in declaration of `MEMORY_READ
STATE'
loadpng.c:311: warning: data definition has no type or storage class
loadpng.c:313: parse error before "png_ptr"
loadpng.c: In function `read_data_memory':
loadpng.c:315: `f' undeclared (first use in this function)
loadpng.c:315: parse error before ')' token
loadpng.c:317: `length' undeclared (first use in this function)
loadpng.c:318: warning: implicit declaration of function `png_error'
loadpng.c:318: `png_ptr' undeclared (first use in this function)
loadpng.c:320: `data' undeclared (first use in this function)
loadpng.c: In function `check_if_png_memory':
loadpng.c:332: `png_size_t' undeclared (first use in this function)
loadpng.c:332: parse error before numeric constant
loadpng.c:332: parse error before ')' token
loadpng.c:333: warning: no return statement in function returning non-void
loadpng.c: In function `load_memory_png':
loadpng.c:342: parse error before "memory_reader_state"
loadpng.c:344: `png_structp' undeclared (first use in this function)
loadpng.c:344: parse error before "png_ptr"
loadpng.c:345: `png_infop' undeclared (first use in this function)
loadpng.c:359: `png_ptr' undeclared (first use in this function)
loadpng.c:359: `PNG_LIBPNG_VER_STRING' undeclared (first use in this function
loadpng.c:365: `info_ptr' undeclared (first use in this function)
loadpng.c:367: `png_infopp' undeclared (first use in this function)
loadpng.c:383: `memory_reader_state' undeclared (first use in this function)
loadpng.c:388: `png_rw_ptr' undeclared (first use in this function)
loadpng.c:388: parse error before "read_data_memory"
mingw32-make: *** [loadpng.o] Error 1

What is the problem here?

-- 
Sincerely and kindest regards, Davin.
Davin Pearson http://www.davinpearson.com