-MYCFLAGS=-Wall -O0 -g `pkg-config --cflags glib-2.0 talloc`
-MYCXXFLAGS=$(MYCFLAGS) `xapian-config --cxxflags`
+WARN_FLAGS=-Wall -Wextra -Wmissing-declarations -Wwrite-strings -Wswitch-enum
+
+CDEPENDS_FLAGS=`pkg-config --cflags glib-2.0 talloc`
+CXXDEPENDS_FLAGS=`pkg-config --cflags glib-2.0 talloc` `xapian-config --cxxflags`
+
+MYCFLAGS=$(WARN_FLAGS) -O0 -g $(CDEPENDS_FLAGS)
+MYCXXFLAGS=$(WARN_FLAGS) -O0 -g $(CXXDEPENDS_FLAGS)