Mine

configure:5589: gcc -c    conftest.c 1>&5
configure: In function 'main':
configure:5590: error: size of array 'static_assert_line_5589' is negative
configure: failed program was:
#line 5582 "configure"
#include "confdefs.h"

#define CONFIGURE_STATIC_ASSERT(condition) CONFIGURE_STATIC_ASSERT_IMPL(condition, __LINE__)
#define CONFIGURE_STATIC_ASSERT_IMPL(condition, line) CONFIGURE_STATIC_ASSERT_IMPL2(condition, line)
#define CONFIGURE_STATIC_ASSERT_IMPL2(condition, line) typedef int static_assert_line_##line[(condition) ? 1 : -1]

int main() {
CONFIGURE_STATIC_ASSERT(sizeof(long) == 8)
; return 0; }