undeclared here (not in a function) in C - c

Question

im new with c language, but i try to unerstand this quark hashing algorithm that was written in c language, and i found an error while im compiling the source code, from what i understand the WIDTH it already declared, but why is it still error ?
this is the source code
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
/* uncomment to printf execution traces */
// #define DEBUG
#if defined(UQUARK)
#define CAPACITY 16
#define RATE 1
#define WIDTH 17
#elif defined(DQUARK)
#define CAPACITY 20
#define RATE 2
#define WIDTH 22
#endif
#define DIGEST WIDTH
typedef uint64_t u64;
typedef uint32_t u32;
typedef uint8_t u8;
typedef struct {
int pos; /* number of bytes read into x from current block */
// u32 x[ WIDTH*8 ]; /* one bit stored in each word */
u32 x[ WIDTH*8 ]; /* one bit stored in each word */
} hashState;
#if defined(UQUARK)
/* 17 bytes */
u8 iv[] = {0xd8,0xda,0xca,0x44,0x41,0x4a,0x09,0x97,
0x19,0xc8,0x0a,0xa3,0xaf,0x06,0x56,0x44,0xdb};
and its showing this error
quark.c:36:10: error : 'WIDTH' undeclared here (not in a function)
u32 x[WIDTH*8];

Answer 1

I guess for some reason neither UQUARK nor DQUARK are defined.
Add this:
#if defined(UQUARK) && defined(DQUARK)
#error both UQUARK and DQUARK are defined
#endif
#if !defined(UQUARK) && !defined(dQUARK)
#error Neither UQUARK nor DQUARK are defined
#endif
just before following line:
#if defined(UQUARK)
Then the compilation will abort if either both UQUARK and DQUARK are defined (which probably makes no sense) or if neither UQUARK nor DQUARK are defined (which probably happens in your case).
Now the question is: who defines UQUARK and/or DQUARK? Only you can tell.