This was added in a prelimnary version of a previous commit that would
automatically load notmuch.el for anyone running emacs. It's not used
at all in the current Makefile.
extra_cxxflags := $(shell xapian-config --cxxflags)
emacs_lispdir := $(shell pkg-config emacs --variable sitepkglispdir)
-emacs_startdir := $(shell pkg-config emacs --variable sitestartdir)
# Now smash together user's values with our extra values
override CFLAGS += $(WARN_FLAGS) $(extra_cflags)