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Rev 77172 Rev 77176
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AC_SUBST(MACOS_SIERRA)
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AC_SUBST(MACOS_SIERRA)
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## clock_gettime is POSIX 1993, but not on macOS prior to 10.12 (Sierra)
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## clock_gettime is POSIX 1993, but not on macOS prior to 10.12 (Sierra)
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## Some OSes need -lrt: Linux (for glibc versions before 2.17), Solaris,
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## Some OSes need -lrt: Linux (for glibc versions before 2.17), Solaris,
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## not FreeBSD.
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## not FreeBSD.
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## Unsurprising, as POSIX 2008 moved it from its timers section to base.
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## Unsurprising, as POSIX 2008 moved it from its timers section to base.
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## timespec_get is C11.
 - 
 
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AC_CHECK_LIB(rt, clock_gettime)
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AC_CHECK_LIB(rt, clock_gettime)
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R_CHECK_FUNCS([clock_gettime timespec_get], [#include <time.h>])
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R_CHECK_FUNCS([clock_gettime], [#include <time.h>])
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## timespec_get is C11.
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## macOS added timespec_get in 10.15 but used 10.15's SDK for 10.14 (Darwin 18)
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case "${host_os}" in
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   darwin1[[012345678]].*)
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   ;;
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   *)
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     R_CHECK_FUNCS([timespec_get], [#include <time.h>])
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   ;;
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esac
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## We need setenv or putenv.  It seems that everyone does have
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## We need setenv or putenv.  It seems that everyone does have
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## putenv, as earlier versions of R would have failed without it.
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## putenv, as earlier versions of R would have failed without it.
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## It is not always declared, so we do not require a declaration.
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## It is not always declared, so we do not require a declaration.
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AC_CHECK_FUNCS(putenv)
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AC_CHECK_FUNCS(putenv)
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AC_CHECK_DECLS([putenv], , , [#include <stdlib.h>])
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AC_CHECK_DECLS([putenv], , , [#include <stdlib.h>])