PROC报错，expected identifier before numeri?报错

proc 程序中包含：

EXEC SQL INCLUDE SQLCA;

代码时，编译报：

test.cpp:48: error: expected identifier before numeric constant
test.cpp:48: error: expected unqualified-id before numeric constant

 
#ifndef SQLCA
#define SQLCA 1
 
struct   sqlca
         {
         /* ub1 */ char    sqlcaid[8];
         /* b4  */ int     sqlabc;
         /* b4  */ int     sqlcode;
         struct
           {
           /* ub2 */ unsigned short sqlerrml;
           /* ub1 */ char           sqlerrmc[70];
           } sqlerrm;
         /* ub1 */ char    sqlerrp[8];
         /* b4  */ int     sqlerrd[6];
         /* ub1 */ char    sqlwarn[8];
         /* ub1 */ char    sqlext[8];
         };
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将这句EXEC SQL INCLUDE SQLCA;声明去掉后，编译报错：

/backprogram/src/test.cpp:479: undefined reference to `SQLCA'
/backprogram/src/test.cpp:524: undefined reference to `SQLCA'

test.cpp:479位置代码为：

      sqlstm.sqlest = (unsigned char  *)&sqlca;

求指导？