vlerq.c sun compile error

Compile 'vlerq.c' under SunOS sparc with native 'cc' failed.

Line #39 in 'vlerq.c'

 #if !defined(_BIG_ENDIAN) && defined(WORDS_BIGENDIAN)

work not as expected because _BIG_ENDIAN is already defined in /usr/include/...

(I do not remember the exact file) as

 #define _BIG_ENDIAN

Looking in 'tclInt.h' one can find:

 #ifdef HAVE_SYS_TYPES_H
 #    include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_PARAM_H
 #    include <sys/param.h>
 #endif
 #ifdef BYTE_ORDER
 #    ifdef BIG_ENDIAN
 #        if BYTE_ORDER == BIG_ENDIAN
 #            undef WORDS_BIGENDIAN
 #            define WORDS_BIGENDIAN 1
 #        endif
 #    endif
 #    ifdef LITTLE_ENDIAN
 #        if BYTE_ORDER == LITTLE_ENDIAN
 #            undef WORDS_BIGENDIAN

My workaround is changing the above line to:

 #if defined(WORDS_BIGENDIAN)
 #        endif
 #    endif
 #endif