Created attachment 3001 [details]
Simple patch

On my system, after running ./waf configue, the `.lock-waf_linux_build` file contains, among other things:

    ...
    options = {..., 'cxx_standard': '-std=c++11', ...}
    ...

Thus breaking the --check-profile command that attempt to split this line on the `=` signs. The split should be performed only on the first `=` and not on the other ones.

Please find attached a patch that fixes the issue.