build: Check non-standard C functions at configure time
* configure.ac: Check 'argp_parse' and 'asprintf' presence.
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					@ -43,6 +43,12 @@ GUILE_PKG([2.2 2.0])
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# 'config.rpath' script.
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					# 'config.rpath' script.
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PKG_CHECK_MODULES(GUILE, [guile-$GUILE_EFFECTIVE_VERSION])
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					PKG_CHECK_MODULES(GUILE, [guile-$GUILE_EFFECTIVE_VERSION])
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					# Check for 'argp' program arguments parser.
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					AC_CHECK_FUNC(argp_parse, [], AC_MSG_ERROR([argp not found]))
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					# Check for non-POSIX string formatting function.
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					AC_CHECK_FUNC(asprintf, [], AC_MSG_ERROR([asprintf not found]))
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# Checks for programs.
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					# Checks for programs.
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GUILE_PROGS
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					GUILE_PROGS
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