Failed 'dub run' with 'Failed to invoke the compiler dmd'

[Timoses via Digitalmars-d-learn]

On Saturday, 31 October 2015 at 04:00:18 UTC, Timoses wrote:
> Linking...
> ld: library not found for -levent
> clang: error: linker command failed with exit code 1 (use -v to 
> see invocation)
> --- errorlevel 1
> dmd failed with exit code 1.

Seems to be fixed by editing dmd.conf (added -L-L/usr/local/lib)

[Environment]

DFLAGS=-I/Library/D/dmd/src/phobos 
-I/Library/D/dmd/src/druntime/import -L-L/Library/D/dmd/lib 
-L-L/usr/local/lib

Have a question though:
Why is it -L-L/usr/local/lib
and not -L/usr/local/lib ?