Optionally (and by default) build CDI application.

Makefile.am

 ## Process this file with automake to produce Makefile.in
 #
-SUBDIRS = src interfaces app examples examples/pio tests
+SUBDIRS = src interfaces examples examples/pio tests
+if ENABLE_CDI_APP
+SUBDIRS += app
+endif
 #
 EXTRA_DIST=config/default \
 	doc/cdi_cman.pdf \

m4/acx_options.m4

@@ -310,6 +310,12 @@ AC_ARG_ENABLE([hirlam-extensions],
               [enable_hirlam_extensions=no])
 AC_MSG_RESULT([$enable_hirlam_extensions])
 AM_CONDITIONAL([ENABLE_HIRLAM_EXTENSIONS],[test x$enable_hirlam_extensions = 'xyes'])
+# ----------------------------------------------------------------------
+# Build CDI application
+AC_ARG_ENABLE([cdi-app],
+              [AS_HELP_STRING([--enable-cdi-app],[build and install CDI application [default=yes]])],
+              [], [enable_cdi_app=yes])
+AM_CONDITIONAL([ENABLE_CDI_APP], [test x$enable_cdi_app = 'xyes'])
 #
 ])
 dnl