autogen.sh: create ChangeLog in a VCS-independent way

Signed-off-by: TAMUKI Shoichi <tamuki@linet.gr.jp>

diff --git a/autogen.sh b/autogen.sh
index 535aef9..4585271 100755 (executable)
--- a/autogen.sh
+++ b/autogen.sh
@@ -2,7 +2,7 @@
 
 mv INSTALL INSTALL.autogen.bak
 # ChangeLog is required for automake
-git log > ChangeLog
+[ ! -f ChangeLog ] && touch ChangeLog
 autoreconf -f -i
 mv INSTALL.autogen.bak INSTALL