# given explicitly on the command line) so mention it first.
all:
-# List all subdirectories here. Each contains its own Makefile.local
-subdirs = compat completion emacs lib
-
-# We make all targets depend on the Makefiles themselves.
-global_deps = Makefile Makefile.local \
- $(subdirs:%=%/Makefile) $(subdirs:%=%/Makefile.local)
-
# Sub-directory Makefile.local fragments can append to these variables
# to have directory-specific cflags as necessary.
extra_cflags :=
extra_cxxflags :=
+# Get settings from the output of configure by running it to generate
+# Makefile.config if it doesn't exist yet.
+
+# If Makefile.config doesn't exist, then srcdir won't be
+# set. Conditionally set it (assuming a plain srcdir build) so that
+# the rule to generate Makefile.config can actually work.
+srcdir ?= .
+
+include Makefile.config
+
+# We make all targets depend on the Makefiles themselves.
+global_deps = Makefile Makefile.config Makefile.local \
+ $(subdirs:%=%/Makefile) $(subdirs:%=%/Makefile.local)
+
+Makefile.config: $(srcdir)/configure
+ifeq ($(configure_options),)
+ @echo ""
+ @echo "Note: Calling ./configure with no command-line arguments. This is often fine,"
+ @echo " but if you want to specify any arguments (such as an alternate prefix"
+ @echo " into which to install), call ./configure explicitly and then make again."
+ @echo " See \"./configure --help\" for more details."
+ @echo ""
+endif
+ $(srcdir)/configure $(configure_options)
+
+# runtime variable definitions available in all subdirs
+include $(srcdir)/Makefile.global
# Finally, include all of the Makefile.local fragments where all the
# real work is done.