If the ragel isn't found, use echo command instead of blank variable.

refs #2137

The reason is we break the aliasing rules a lot,
this is not neccessarily a bad thing but we need to either
choose to adhere to the rules and add code complexity or
disable it (only gcc attempts to do it by default).

refs #2137

refs #937

You can reenable it by --enable-lto=yes

refs #1688

Convert the documentation to texinfo format, it will be much easier to support that without xmlto and all docbook stylesheets

User reported broken LTO on clang-3.0 / FreeBSD.

refs #1883

Each BSD flavor has slightly different way to handle CPU counting,
CPU set management and affinity setting.

refs #1882