dmake: Error: -- Configuration file `C:\Strawberry\c\bin\startup\startup.mk' not found

You need a functional 'dmake'exe' and that one is not functional because 'startup.mk' can't be found.

You probably just need to copy the 'startup' directory across to Strawberry/c/bin. You should find that 'startup' directory in the same directory that contained 'dmake.exe'.

Cheers,
Rob