I'm building Thunderbird with mach. Previously, I would touch a file in, say, mailnews/mime/src, and run my "custom" set of make invocations: make -C mailnews/mime make -C mailnews/ make -C mail/ (just in case) make -C mozilla/toolkit/ (IIRC, relinks libxul.so) Now I've switched to mach, and I'm getting: 0:41.65 Unified_cpp_gfx_layers2.o 0:41.65 Unified_cpp_gfx_layers3.o 1:02.96 libgfx_layers.a.desc 1:04.80 libthebes.a.desc 1:08.70 Unified_cpp_dom_plugins_test_testplugin0.o 1:14.15 libnptest.so 1:14.96 Unified_cpp_test_testplugin_secondplugin0.o 1:17.73 libnpsecondtest.so These take quite some time (my laptop is getting old). - Is this a bug in mach, or in a Makefile that needs to be updated? - If I want to use my old process to speed things up and not wait 4min every time, is it safe to use the same set of commands or will they confuse mach? Thanks and congratulations for the mach tool, which is already pretty great as it is! ~ jonathan