Hi, I made one change in gcc-4.1.2 source code. I added prfintf(" TOPLEVEL\n"); statement in toplev_main() function in toplevel.c file. Of course I added #include<stdio.h> in that file. 1)I tried to execute "make bootstrap" command after configuration. I got the error shown below. What could be the reason? 2)I think general installation commands can be used to install modified gcc source. Am I right? ----------------------------------------------------- make[1]: Leaving directory `/users/pg05/ranjithk/GCC/obj/build-i686-pc-linux-gnu/fixincludes' Configuring in ./intl configure: loading cache ./config.cache configure: error: `CFLAGS' has changed since the previous run: configure: former value: -g -O2 configure: current value: -g -O2 configure: error: changes in the environment can compromise the build configure: error: run `make distclean' and/or `rm ./config.cache' and start over make: *** [configure-intl] Error 1 ___________________________________________________________ Yahoo! Mail is the world's favourite email. Don't settle for less, sign up for your free account today http://uk.rd.yahoo.com/evt=44106/*http://uk.docs.yahoo.com/mail/winter07.html