Re: [PATCH] build: fix out-of-tree builds

diff --git a/bf/724b048d483e716735718548c0f9c7652e1c26 b/bf/724b048d483e716735718548c0f9c7652e1c26
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+       Wed, 15 May 2013 09:31:40 -0700 (PDT)\r
+From: Jani Nikula <jani@nikula.org>\r
+To: David Bremner <david@tethera.net>, notmuch@notmuchmail.org\r
+Subject: Re: [PATCH] build: fix out-of-tree builds\r
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+Date: Wed, 15 May 2013 19:31:37 +0300\r
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+\r
+On Wed, 15 May 2013, David Bremner <david@tethera.net> wrote:\r
+> Jani Nikula <jani@nikula.org> writes:\r
+>>  # List all subdirectories here. Each contains its own Makefile.local\r
+>> -subdirs := compat completion emacs lib man parse-time-string\r
+>> -subdirs += performance-test util test\r
+>> +subdirs = compat completion emacs lib man parse-time-string performance-test util test\r
+>\r
+> Is this a functional change or a cosmetic one?\r
+\r
+Functional. All of it seems to be required for out-of-tree builds (*) to\r
+work. I'm afraid I've forgotten exactly why both := and += make it fail\r
+(I wrote the patch a few months ago).\r
+\r
+Jani.\r
+\r
+\r
+(*) For example:\r
+\r
+$ cd /some/empty/dir\r
+$ /path/to/notmuch/configure\r
+$ make\r