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$ perl -e "print pack 'Q',1"
Invalid type 'Q' in pack at -e line 1.

/* HAS_QUAD:
 *    This symbol, if defined, tells that there's a 64-bit integer typ
+e,
 *    Quad_t, and its unsigned counterpart, Uquad_t. QUADKIND will be 
+one
...
#   define QUAD_IS_LONG_LONG    3
#   define QUAD_IS_INT64_T    4
#endif

$ perl "-V:.*?quad.*?"
d_quad='define';
quadkind='3';
quadtype='long long';
uquadtype='unsigned long long';