+AC_CANONICAL_HOST
+
+EXTRA_CFLAGS=""
+case "$host_os" in
+ darwin*) AC_MSG_WARN([Disabling smart preprocessing])
+ EXTRA_CFLAGS="-no-cpp-precomp $EXTRA_CFLAGS";;
+esac
+
+AC_ARG_ENABLE(debug,
+[ --enable-debug Compilation flags to allow debugging [default=yes]],
+ if test $enableval == "yes"
+ then
+ EXTRA_CFLAGS="-g $EXTRA_CFLAGS"
+ fi,
+ EXTRA_CFLAGS="-g $EXTRA_CFLAGS"
+)
+
+AC_SUBST(EXTRA_CFLAGS)
+