Just downloaded and built the sid-milter-0.2.0 package and got:
cc: compilation of header file requested
make: *** [depend] Error 1
It seems to build and test OK, but....
Change the sid-milter-0.2.0/sid-filter/Makefile.m4 as follows and the
error goes away:
< define(`bldSOURCES', `sid-filter.c rfc2822.h util.c ')
> define(`bldSOURCES', `sid-filter.c rfc2822.c util.c ')