Hi, I've searched the archives and the darwinbuild website for this one, and tried some things of my own, and haven't been able to find an answer, so here I am :-). I'm trying to hunt down a crash in /usr/libexec/bootpd by building a custom bootp-133.6 from Darwin 8G32, using darwinbuild. I want to turn on as much debugging as I can using -ggdb so that I can inspect variables and list source; the default seems to be '-g' which doesn't contain source listing: (gdb) list 1 {standard input}: No such file or directory. in {standard input} Now bootp is a project builder project with a Makefile; I've tried modifying settings in Makefile.postamble including ALL_MFLAGS and ALL_CFLAGS, and DEBUG_SYMBOLS_CFLAGS but they don't get picked up when I subsequently invoke darwinbuild bootp. It still uses the default compiler flags. How do I modify this project to include custom compiler flags? Thanks, Graham.