Hi, We have a big project that might benefit from precompiled headers but we don't want to append tens of thousands of .c files with #include "master.h". Can we simply add -include "master.h" to CPPFLAGS during building? In this way, is "master.h" the 1st one to be included for any .c file? Will gcc make use of master.gch if master.h is given in command line? Thanks! -- Zuxy