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require 'mkmf'
target = "io/wait"
unless /djgpp|mswin|mingw|human/ =~ RUBY_PLATFORM
fionread = %w[sys/ioctl.h sys/filio.h].find do |h|
checking_for("FIONREAD") {macro_defined?("FIONREAD", "#include <#{h}>\n")}
end
if fionread
$defs << "-DFIONREAD_HEADER=\"<#{fionread}>\""
create_makefile(target)
end
end
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