[devel] Updated INSTALL

(omitted autogen.sh, ../configure should be ./configure)
diff --git a/INSTALL b/INSTALL
index a50293d..d0d3e80 100644
--- a/INSTALL
+++ b/INSTALL
@@ -16,9 +16,10 @@
 the tools.  To be really sure that you aren't using any of the included
 pre-built scripts, you can do this:
 
-    ../configure --enable-maintainer-mode
+    ./configure --enable-maintainer-mode
     make maintainer-clean
-    ../configure [--prefix=/path] [other options]
+    ./autogen.sh
+    ./configure [--prefix=/path] [other options]
     make
     make install
     make check