Any suggestions gratefully received. Can I put anything in configure.ac/Makefile.am to set some default CXXFLAGS? For my own programs I _always_ use -Wall -pedantic -ansi and I usually want either -O2 or -g -O0. How do I get GNU build to detect the processor. In particular, how do I get it to compile for pentium4 or i686 depending on the processor? -- JDL Non enim propter gloriam, diuicias aut honores pugnamus set propter libertatem solummodo quam Nemo bonus nisi simul cum vita amittit.