[ocrfeeder] Generate a ChangeLog file from git when running make dist

[Joaquim Manuel Pereira Rocha <jrocha src gnome org>]

commit a8ee75220a4a848e01d9975eeed1e9aca7dc9112
Author: Alberto Garcia <agarcia igalia com>
Date:   Sun Aug 7 12:25:31 2011 +0200

    Generate a ChangeLog file from git when running make dist

 Makefile.am |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index db6f580..f971ea1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,16 @@
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 
 SUBDIRS = src resources po bin help
+
+dist-hook:
+	@if test -d "$(srcdir)/.git"; \
+	then \
+		echo Creating ChangeLog && \
+		( cd "$(top_srcdir)" && \
+		 $(top_srcdir)/missing --run git log --stat ) > ChangeLog.tmp \
+		&& mv -f ChangeLog.tmp $(top_distdir)/ChangeLog \
+		|| ( rm -f ChangeLog.tmp ; \
+		    echo Failed to generate ChangeLog >&2 ); \
+	else \
+		echo A git clone is required to generate a ChangeLog >&2; \
+	fi