+If you want to add to both compile and link flags at build time
+without putting them in the configuration, you can use an otherwise
+unused Makefile macro, like this:
+ make AM_CFLAGS=--coverage
+
+That does not include that setting in the configuration, so you will
+have to repeat it if you re-run "make". One example would be if you
+build the test suite as a separate step:
+ make test AM_CFLAGS=--coverage
+
+Though note that the Makefile test target depends on the default
+target, so both be can built in one step with "make test".
+