From c9bcc4628eb767167e331be58b08d51cd71c3dbe Mon Sep 17 00:00:00 2001
From: James Lamb <jaylamb20@gmail.com>
Date: Tue, 28 Jul 2020 12:02:06 -0500
Subject: [PATCH] add autoconf back

---
 .ci/test_r_package.sh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/.ci/test_r_package.sh b/.ci/test_r_package.sh
index 50cff0988735..2d37781f44e0 100755
--- a/.ci/test_r_package.sh
+++ b/.ci/test_r_package.sh
@@ -130,6 +130,15 @@ LOG_FILE_NAME="lightgbm.Rcheck/00check.log"
 if [[ $R_BUILD_TYPE == "cmake" ]]; then
     Rscript build_r.R --skip-install || exit -1
 elif [[ $R_BUILD_TYPE == "cran" ]]; then
+
+    # on Linux, we recreate configure in CI to test if
+    # a change in a PR has changed configure.ac
+    if [[ $OS_NAME == "linux" ]]; then
+        autoconf \
+            --output R-package/configure \
+            R-package/configure.ac \
+        || exit -1
+    fi
     ./build-cran-package.sh || exit -1
 
     num_files_changed=$(