[librest] build: Add ${ACLOCAL_FLAGS} to ACLOCAL_AMFLAGS

[Damien Lespiau <dlespiau src gnome org>]

commit fdd2fcf6721eda9c753ff05e20226fd4ecf6cca0
Author: Damien Lespiau <damien lespiau intel com>
Date:   Sat Sep 3 16:54:56 2011 +0100

    build: Add ${ACLOCAL_FLAGS} to ACLOCAL_AMFLAGS
    
    ACLOCAL_FLAGS allow you to define extra directories to look for m4 macros.
    autoreconf parses Makefile.am to add ACLOCAL_AMFLAGS when invoking aclocal.
    
    Adding ${ACLOCAL_FLAGS} to ACLOCAL_AMFLAGS make autoreconf grab flags from
    the environment.
    
    librest already had something to deal with it in autogen.sh, however having
    it in autogen.sh does not help when regenerating the configure script
    automatically (as automake now has rules to rebuild configure whenever
    configure.ac changes, ie by-passing autogen.sh)

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 928587e..4dd9d8f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -10,7 +10,7 @@ CLEANFILES = $(pkgconfig_DATA)
 
 DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc
 
-ACLOCAL_AMFLAGS = -I build
+ACLOCAL_AMFLAGS = -I build ${ACLOCAL_FLAGS}
 
 if GCOV_ENABLED
 cov-reset: