+AC_SUBST([guileobjectdir])
+
+dnl The GnuTLS bindings are necessary for substitutes over HTTPS and for 'guix
+dnl pull', among other things.
+GUILE_MODULE_AVAILABLE([have_gnutls], [(gnutls)])
+if test "x$have_gnutls" != "xyes"; then
+ AC_MSG_ERROR([The Guile bindings of GnuTLS are missing; please install them.])
+fi
+
+dnl Check for Guile-Git.
+GUILE_MODULE_AVAILABLE([have_guile_git], [(git)])
+if test "x$have_guile_git" != "xyes"; then
+ AC_MSG_ERROR([Guile-Git is missing; please install it.])
+fi
+
+dnl Check for Guile-JSON.
+GUIX_CHECK_GUILE_JSON
+if test "x$guix_cv_have_recent_guile_json" != "xyes"; then
+ AC_MSG_ERROR([Guile-JSON is missing; please install it.])
+fi
+
+dnl Guile-Sqlite3 is used by the (guix store ...) modules.
+GUIX_CHECK_GUILE_SQLITE3
+if test "x$guix_cv_have_recent_guile_sqlite3" != "xyes"; then
+ AC_MSG_ERROR([A recent Guile-SQLite3 could not be found; please install it.])
+fi
+
+GUILE_MODULE_AVAILABLE([have_guile_gcrypt], [(gcrypt hash)])
+if test "x$have_guile_gcrypt" != "xyes"; then
+ AC_MSG_ERROR([Guile-Gcrypt could not be found; please install it.])
+fi
+
+dnl Guile-newt is used by the graphical installer.
+GUILE_MODULE_AVAILABLE([have_guile_newt], [(newt)])
+
+AC_ARG_ENABLE([installer],
+ AS_HELP_STRING([--enable-installer], [Build the graphical installer sources.]))
+
+AS_IF([test "x$enable_installer" = "xyes"], [
+if test "x$have_guile_newt" != "xyes"; then
+ AC_MSG_ERROR([Guile-newt could not be found; please install it.])
+fi
+])