also check that PLATFORM and ENCODING are set
allow compiling with dmd 2.057 too
make sure that COMPILER and LIBRARY are set
really convert any -Wl flags to DMD
Merge pull request #10 from StEvUgnIn/patch-2
Add a cast to be able to extend the "enum"
Merge pull request #9 from StEvUgnIn/patch-1
add helper program to output D version