From 7773c3c1771f2fbb267b3661a1f6e709d67d50b0 Mon Sep 17 00:00:00 2001
From: "k.koide" <k.koide@aist.go.jp>
Date: Wed, 26 Jun 2024 16:37:30 +0900
Subject: [PATCH] update installation

---
 README.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index c635a0aa..410944a4 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,10 @@ All the following optimizers were derived from the implementations in GTSAM
 ```bash
 # Install gtsam
 git clone https://github.com/borglab/gtsam
-mkdir gtsam/build && cd gtsam/build
+cd gtsam
+git checkout 4.2a9
+
+mkdir build && cd build
 cmake .. \
   -DGTSAM_BUILD_EXAMPLES_ALWAYS=OFF \
   -DGTSAM_BUILD_TESTS=OFF \