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Akira TAGOH authored
On older libc, _POSIX_C_SOURCE didn't satisfy to use posix_fadvise() and AC_CHECK_FUNCS doesn't check a header file if the function is declared there properly. so use AC_LINK_IFELSE instead.
ab26a722
On older libc, _POSIX_C_SOURCE didn't satisfy to use posix_fadvise() and AC_CHECK_FUNCS doesn't check a header file if the function is declared there properly. so use AC_LINK_IFELSE instead.