dependency analysis for makefile construction

[dan via Digitalmars-d-learn]

Are there any FOSS tools for doing dependency analysis of (e.g.) 
all the d files in a directory, to let you know when a .o file 
needs to be regenerated?

This presumably would depend mostly on the import statements 
(including import of any file to be used in string construction, 
as in 'auto my_string = import("my_file");').

My guess is there must be, because one of the big deals about d 
is the more regular syntax it offers to make compiler building 
more reliable.

(I'm using gdc, and building with gnumake.)

TIA for any info!

dan