How to link to libdl under linux

[MrSmith]

> dmd -m32 
> -of.dub/build/application-debug-x86-dmd-DA39A3EE5E6B4B0D3255BFEF95601890AFD80709/test 
> -c 
> -of.dub/build/application-debug-x86-dmd-DA39A3EE5E6B4B0D3255BFEF95601890AFD80709/test.o 
> -debug -g -w -version=Have_test -version=Have_derelict_glfw3 
> -version=Have_derelict_util 
> -I../../.dub/packages/derelict-glfw3-master/source 
> -I../../.dub/packages/derelict-util-1.0.0/source test.d 
> ../../.dub/packages/derelict-glfw3-master/source/derelict/glfw3/package.d 
> ../../.dub/packages/derelict-glfw3-master/source/derelict/glfw3/glfw3.d 
> ../../.dub/packages/derelict-util-1.0.0/source/derelict/util/xtypes.d 
> ../../.dub/packages/derelict-util-1.0.0/source/derelict/util/exception.d 
> ../../.dub/packages/derelict-util-1.0.0/source/derelict/util/system.d 
> ../../.dub/packages/derelict-util-1.0.0/source/derelict/util/loader.d 
> ../../.dub/packages/derelict-util-1.0.0/source/derelict/util/sharedlib.d 
> ../../.dub/packages/derelict-util-1.0.0/source/derelict/util/wintypes.d
> Linking...

Turns out, dub includes actual dependencies source files into 
object file. _l-ldl flag with this works fine. but i want to use 
.a files instead