there should be no warnings; on older and on non-GNU systems the
generated warnings may still be useful.
+Use --enable-silent-rules to cause 'make' to chatter less. This is
+helpful when combined with options like --enable-gcc-warnings that
+generate long shell-command lines. 'make V=0' also suppresses the
+chatter.
+
Use --enable-link-time-optimization to enable link-time optimizer. If
you're using GNU compiler, this feature is supported since version 4.5.0.
If `configure' can determine number of online CPUS on your system, final