build: add automake serial-tests version check
The serial-tests directive was added in automake v0.11. Add an ad-hoc version check to find out if it's safe to enable. Fixes the autotools build with older versions of automake.
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@ -14,7 +14,11 @@
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AC_PREREQ(2.57)
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AC_INIT([libuv], [0.11.5], [https://github.com/joyent/libuv/issues])
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AM_INIT_AUTOMAKE([foreign serial-tests subdir-objects -Wall -Werror])
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# Use AM_SILENT_RULES as an ad-hoc version check to find out if it's safe
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# to use the serial-tests directive. Both were added in automake v0.11.
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AM_INIT_AUTOMAKE(m4_ifdef([AM_SILENT_RULES],
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[-Wall -Werror foreign subdir-objects serial-tests],
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[-Wall -Werror foreign subdir-objects]))
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AC_CONFIG_MACRO_DIR([m4])
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AC_CANONICAL_HOST
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AC_ENABLE_SHARED
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