-NOTMUCH_CFLAGS=$(WARN_FLAGS) -O0 -g $(NOTMUCH_DEPENDS_FLAGS)
-NOTMUCH_CXXFLAGS=$(WARN_FLAGS) -O0 -g $(NOTMUCH_CXX_DEPENDS_FLAGS)
+emacs_lispdir := $(shell pkg-config emacs --variable sitepkglispdir)
+# Hard-code if this system doesn't have an emacs.pc file
+ifeq ($(emacs_lispdir),)
+ emacs_lispdir = $(prefix)/share/site-lisp
+endif