Second step of revamping the build system

The original Makefile.am was drawn to the top level.  This commit
breaks it out into the various directories with SUBDIRS connecting
them.  This makes each directory easier to maintain.

autogen.sh

@@ -6,4 +6,5 @@ aclocal && \
 autoheader && \
 autoconf && \
 libtoolize --copy && \
+gtkdocize --docdir docs && \
 automake --add-missing --copy

configure.ac

@@ -31,6 +31,7 @@ AC_PROG_MAKE_SET
 
 AC_PATH_PROG([M4], [m4])
 AC_PATH_PROG([XSLTPROC], [xsltproc])
+GTK_DOC_CHECK([1.18],[--flavour no-tmpl])
 
 # TODO check this --- we don't want kmod necessarily
 # PKG_CHECK_MODULES(KMOD, [libkmod >= 5])
@@ -108,6 +109,14 @@ AS_IF([test "x$with_python" != "xno"], [
 ])
 AM_CONDITIONAL([HAVE_PYTHON_DEVEL], [test "$have_python_devel" = "yes"])
 
+# ------------------------------------------------------------------------------
+
+have_introspection=no
+AC_ARG_ENABLE([introspection],
+        [AS_HELP_STRING([--without-introspection], [Disable man page index and systemd-python (default: no)])])
+GOBJECT_INTROSPECTION_CHECK([1.31.1])
+AM_CONDITIONAL([HAVE_INTROSPECTION], [test "$have_introspection" = "yes"])
+
 # ------------------------------------------------------------------------------
 have_selinux=no
 AC_ARG_ENABLE(selinux, AS_HELP_STRING([--disable-selinux], [Disable optional SELINUX support]))
@@ -242,6 +251,18 @@ AC_SUBST([rootlibdir], [$with_rootlibdir])
 # ------------------------------------------------------------------------------
 
 AC_CONFIG_FILES([Makefile
+                 docs/Makefile
                  docs/gudev/Makefile
-                 docs/libudev/Makefile])
+                 docs/libudev/Makefile
+                 hwdb/Makefile
+                 keymaps-force-release/Makefile
+                 keymaps/Makefile
+                 man/Makefile
+                 rules/Makefile
+                 src/Makefile
+                 src/gudev/Makefile
+                 src/libudev/Makefile
+                 src/test/Makefile
+                 src/udev/Makefile
+                 test/Makefile])
 AC_OUTPUT

docs/Makefile.am

@@ -0,0 +1,8 @@
+if ENABLE_GUDEV
+SUBDIRS = \
+	libudev
+if ENABLE_GTK_DOC
+SUBDIRS += \
+	gudev
+endif
+endif