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Do not use an absolute path for <unistd.h> when checking for return
type of usleep. Thanks to Michael Carmack.
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@ -272,7 +272,7 @@ GUILE_FUNC_DECLARED(usleep, unistd.h)
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### we'd like to return it; otherwise, we'll fake it.
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AC_CACHE_CHECK([return type of usleep], guile_cv_func_usleep_return_type,
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[AC_EGREP_HEADER(changequote(<, >)<void[ ]+usleep>changequote([, ]),
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/usr/include/unistd.h,
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unistd.h,
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[guile_cv_func_usleep_return_type=void],
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[guile_cv_func_usleep_return_type=int])])
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case "$guile_cv_func_usleep_return_type" in
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