How to build a package as application ?

[guiguidu60]

I'm a newbie with D language, and my first problem ever is:

I have a hello world program build with DUB on Linux, but the 
program as marked as "application/x-sharedlib" and not 
"application/x-executable" (in properties of the file): so, I 
can't able to execute the program from the file explorer (need to 
do ./helloworld within a terminal).