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lkversplit in sed

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sh compat:
	no ! pipeline;
	no {} ~ expansion;
	no parameters beyond `$9';
	$() is POSIX form of ``;
	no variable and a function with the same name;
	all variable assignments preceding commands are global
		unless the command is executed from the file system;
        The SVR4.2 shell does not allow the `IFS', `MAILCHECK', `PATH',
	`PS1', or `PS2' variables to be unset;


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CC,CXX check order

check against -m586 -m686 -mpentium -mpentiumpro

