[tracker] build: Note we don't support srcdir != builddir

[Colin Walters <walters src gnome org>]

commit 0a40867748c89e78a44074ed7dca685c01972c07
Author: Colin Walters <walters verbum org>
Date:   Fri Sep 28 09:16:08 2012 -0400

    build: Note we don't support srcdir != builddir
    
    This is presently due to the vapigen tool.
    
    Signed-off-by: Colin Walters <walters verbum org>

 configure.ac |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6043cb8..a52ef99 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,6 +54,10 @@ AM_INIT_AUTOMAKE([1.11 no-define tar-ustar -Wno-portability])
 
 AM_SILENT_RULES([yes])
 
+dnl http://people.gnome.org/~walters/docs/build-api.txt
+dnl We don't support srcdir != builddir.
+echo \#buildapi-variable-no-builddir >/dev/null
+
 IDT_COMPILE_WARNINGS
 
 TRACKER_MAJOR_VERSION=tracker_major_version