Add support for shortcuts

Signed-off-by: Chirantan Ekbote <chirantan.ekbote@gmail.com>
Change to downloads directory before calling curl

Signed-off-by: Chirantan Ekbote <chirantan.ekbote@gmail.com>
Append compile flags rather than owerwrite them

Signed-off-by: Chirantan Ekbote <chirantan.ekbote@gmail.com>