[mm-common] Build: Suggest ACLOCAL_PATH instead of ACLOCAL_FLAGS

[Daniel Elstner <daniel src gnome org>]

commit b13561c71119e39a64b1d4f17657418bec23be14
Author: Daniel Elstner <daniel kitta gmail com>
Date:   Fri Aug 21 00:36:20 2015 +0200

    Build: Suggest ACLOCAL_PATH instead of ACLOCAL_FLAGS
    
    * Makefile.am (postinst-acdir-notice): If the installed macros
    are not on the aclocal search patch, suggest the modern solution
    of setting ACLOCAL_PATH instead of ACLOCAL_FLAGS.

 Makefile.am |   19 +++++++++----------
 1 files changed, 9 insertions(+), 10 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 4430391..c1c2063 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -173,13 +173,12 @@ install-data-hook: $(if $(DESTDIR),,postinst-acdir-notice)
 postinst-acdir-notice:
        @$(POST_INSTALL)
        @-acdir=`$${ACLOCAL-aclocal} --print-ac-dir 2>/dev/null || :`; \
-       if test "x$$acdir" = 'x$(aclocal_macrodir)'; then :; else \
-         case " $$ACLOCAL_FLAGS " in *' -I $(aclocal_macrodir) '*) ;; *) \
-           echo; echo 'NOTICE:'; echo; \
-           echo 'The $(PACKAGE_NAME) Autoconf macro files have been installed in a different'; \
-           echo 'prefix than the system aclocal directory.  In order for the installed'; \
-           echo 'macros to be found, it may be necessary to add the $(PACKAGE_NAME) include'; \
-           echo 'path to the ACLOCAL_FLAGS environment variable:'; echo; \
-           echo "  ACLOCAL_FLAGS='-I $(aclocal_macrodir)'; export ACLOCAL_FLAGS"; echo;; \
-         esac; \
-       fi
+       case ":$$ACLOCAL_PATH:$$acdir:" in *':$(aclocal_macrodir):'*) ;; *) \
+         echo; echo 'NOTICE:'; echo; \
+         echo 'The $(PACKAGE_NAME) Autoconf macro files have been installed in a different'; \
+         echo 'prefix than the system aclocal directory.  In order for the installed'; \
+         echo 'macros to be found, it may be necessary to add the $(PACKAGE_NAME) include'; \
+         echo 'path to the ACLOCAL_PATH environment variable:'; echo; \
+         echo '  ACLOCAL_PATH="$(aclocal_macrodir)"'; \
+         echo '  export ACLOCAL_PATH'; echo;; \
+       esac