As I count it there is an extra right curly bracket which will be a error.
You mean an extra *left* curly bracket ? That seems to be normal. I get it in the Makefiles that 'perl Makefile.PL' builds for me, and it doesn't pose any problems.
If that syntax is causing a problem for you, then perhaps it's your version of dmake that's at fault. (I have version 4.11-20080107-SHAY from CPAN).