remove certain makefile rules during make dist

Dear list,

I am developing my project under linux. Except for the usual 
automake/autoconf/libtool rules, I have some machine dependent rules in 
Makefile.am to reduce compile time during development. Is there a way to 
remove these rules automatically during 'make dist'? I guess I need to 
remove them from makefile.am and their corresponding parts in configure 
so a install-hook will not work.

Many thanks in advance.

-- 
Bo Peng