check_sed() {
tmp="`pwd`/check_sed"
-trap "rm $tmp" EXIT
+trap "rm $tmp{,-e} 2>/dev/null" EXIT
echo "test file for GNU sed" > $tmp
if ! sed -i -e 's/sed//' $tmp >/dev/null 2>&1
then
check m4 1.4.16
check libtool 2.4
check pkg-config
-check cmake
+check cmake 2.8.8
check yasm
check_tar
check ragel