PHP (4.2.2 && 4.2.3 tested) fail to compile against lib gd (2.0.4 && 2.0.7 tested, with freetype2, libjpeg and libpng) with something like:

In file included from gd.c:83:
gd_ctx.c: In function `_php_image_output_ctx':
gd_ctx.c:70: structure has no member named `free'
gd_ctx.c:98: structure has no member named `free'
gd.c: In function `_php_image_type':
gd.c:1014: structure has no member named `free'
gd.c:1017: structure has no member named `free'
gd.c: In function `_php_image_create_from':
gd.c:1209: structure has no member named `free'

This is regarding structure gdIOCtx defined in gd_io.h from the gd lib.

typedef struct gdIOCtx {
        int     (*getC)(struct gdIOCtx*);
        int     (*getBuf)(struct gdIOCtx*, void*, int);

        void     (*putC)(struct gdIOCtx*, int);
        int     (*putBuf)(struct gdIOCtx*, const void*, int);

        int     (*seek)(struct gdIOCtx*, const int);
        long    (*tell)(struct gdIOCtx*);

        void    (*gd_free)(struct gdIOCtx*);

} gdIOCtx;

as you can see the member is called gd_free, not free. correcting this makes php compile like a charm.