It seems to stop exception handling from being able to recognise which
exception was thrown.
# (shutdown command not available for OpenBSD yet).
# FreeBSD: use clang++ by default, supports sanitizers, requires linking with -lrt
+# Cannot use -fno-rtti: apparently prevents exception handling from working properly.
#CXX=clang++
-#CXXOPTS=-std=c++11 -Os -Wall -fno-rtti
+#CXXOPTS=-std=c++11 -Os -Wall
#LDFLAGS=-lrt
#BUILD_SHUTDOWN=no
#SANITIZEOPTS=-fsanitize=address,undefined