-L--demangle=dlang doesn't work

[Venkat]

Why does gcc say "unknown demangling style `dlang'" ? Do I need 
GDC for demangling to work ?


85198AB7DE24894B5F742FBD5/libvibe-d_data.a 
/home/venkat/.dub/packages/vibe-d-0.8.2/vibe-d/utils/.dub/build/library-unittest-linux.posix-x86_64-dmd_2077-B9AE30DD34FDC5ADDE81E208F10DF014/libvibe-d_utils.a -L--no-as-needed -L--demangle=dlang -L-lsqlite3 -L-levent_pthreads -L-levent -L-lssl -L-lcrypto -L-ldl -g
/usr/bin/ld: unknown demangling style `dlang'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
FAIL 
.dub/build/webmarx-test-application-unittest-linux.posix-x86_64-dmd_2077-C5DB1ABAED0A1191C5B2ACAFDC70EAC6/ webmarx-test-application executable
dmd failed with exit code 1.
Full exception: 
object.Exception at source/dub/compilers/compiler.d(115): dmd failed 
with exit code 1.