Incompatible pointer assignment warning

Question

I am writing a function that parses a texture and animation data file and loads it into some global structures that I declared. I get a compiler warning "Assignment from an incompatible pointer type" on a specific line. This is a lot of code, so I'm just going to post the important parts here.

Firstly, I have a structure data type for my animation routines:

    typedef struct {
        unsigned int frames;
        GLuint *tex;
        float *time;
        struct animation *next;
    } animation;

As you can see, the last variable in the structure is a pointer to another default animation when the animation is complete.

Here is the declaration of the download function:

    void LoadTexturePalette(GLuint **texture, animation **anim, const char *filename)

The function loads information into an array of animations, therefore a double pointer.

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    fread(tmp, 1, 4, file);
    (*anim)[i].next = &((*anim)[*tmp]);

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Answer 1

   typedef struct { /* no tag in definition */
       unsigned int frames;
       GLuint *tex;
       float *time;
       struct animation *next; /* pointer to an undefined structure */
   } animation;

(typedef struct animation { /* ... */ } animation;) "struct animation" undefined. undefined, .

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    typedef struct animation { /* tag used in definition */
        unsigned int frames;
        GLuint *tex;
        float *time;
        struct animation *next; /* pointer to another of this structure */
    } animation;