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Oracle Solaris Studio 12.3 (Sun C 5.12 2011/11/16) by default does not conform to C99; it defines __STDC_VERSION__ to be 199409L, so the Bison code does not include <stdint.h> (not required by C89 amendment 1) even though this compiler does have <stdint.h>. On this platform <limits.h> defines INT_LEAST8_MAX (POSIX allows this) so the skeleton got confused and thought that <stdint.h> had been included even though it wasn’t. * data/skeletons/c.m4 (b4_c99_int_type_define) [!__PTRDIFF_MAX__]: Always include <limits.h>. (YY_STDINT_H): Define when <stdint.h> was included. All uses of expressions like ‘defined INT_LEAST8_MAX’ changed to ‘defined YY_STDINT_H’, since Sun C 5.12 <limits.h> defines macros like INT_LEAST8_MAX but does not declare types like int_least8_t.