#!/usr/bin/awk -f

BEGIN {
	max_context = 2;
	context[""] = 0;
}

function print_context()
{
	for (i = 0; i < max_context; i++)
		if (context[i])
			print context[i];
}

function print_error()
{
	print;
	delete context;
	next;
}

/: ((internal compiler |Internal )?error|sorry, unimplemented):| needs unknown symbol | modversion changed |: undefined reference / {
	print_error();
}

# we might not know what caused this error, better print some context
/^make.*: \*\*\*/ {
	print_context();
	print_error();
}

{
	for (i = 0; i < max_context - 1; i++)
		context[i] = context[i + 1];
	context[max_context - 1] = $0;
}