The INSTALL file is being overwritten by autoreconf, but it is committed
as empty file. As a result, the INSTALL file always shows as modified.
Instead, remove INSTALL from git and ignore it.
diff --git a/.gitignore b/.gitignore
index e15c19b..d1a0b33 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,6 +39,7 @@
 ltmain.sh
 missing
 stamp-h1
+INSTALL
 
 # vim
 *.sw?