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+# Copyright (C) 2015-2016 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+MAKEFLAGS += -rR
+.SECONDARY:
+.DELETE_ON_ERROR:
+
+# Have GCC generate header dependency info (pair this with `-include`
+# in common.each.mk
+ifneq ($(AUTODEPS),)
+CFLAGS += -MD -MF $(patsubst $(@D)/%.o,$(@D)/.%.mk,$@) -MP
+endif
+
+CPPFLAGS += -I$(topoutdir)
+M4FLAGS += -I$(topoutdir) -I$(<D) -I$(@D)