From ee3f5f098f14ade7243b259124bbf9123a7dfe42 Mon Sep 17 00:00:00 2001
From: Kyle Edwards <kyedwards@nvidia.com>
Date: Fri, 7 Aug 2026 14:39:52 -0400
Subject: [PATCH 1/4] Fix how `build.sh` determines CUDA version

In https://github.com/rapidsai/cudf/pull/23472, we incorrectly used
`RAPIDS_CUDA_VERSION` in `build.sh`. This variable comes from CI
only and should not be required to build locally. Determine the
CUDA version in a similar manner to rapids-build-backend: run
`nvcc --version` and parse the output.

Fixes https://github.com/rapidsai/cudf/issues/23587
---
 build.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/build.sh b/build.sh
index dc930d110f65..86c29890b044 100755
--- a/build.sh
+++ b/build.sh
@@ -63,6 +63,8 @@ CUDF_JAR_JAVA_BUILD_DIR="$REPODIR/java/target"
 
 BUILD_DIRS="${LIB_BUILD_DIR} ${CUDF_BUILD_DIR} ${DASK_CUDF_BUILD_DIR} ${KAFKA_LIB_BUILD_DIR} ${CUDF_KAFKA_BUILD_DIR} ${CUSTREAMZ_BUILD_DIR} ${CUDF_JAR_JAVA_BUILD_DIR} ${PYLIBCUDF_BUILD_DIR} ${STREAMING_LIB_BUILD_DIR}"
 
+CUDA_VERSION="$(nvcc --version | sed -E -n 's/^.*release ([0-9]+\.[0-9]+).*$/\1/p')"
+
 # Set defaults for vars modified by flags to this script
 VERBOSE_FLAG=""
 BUILD_TYPE=Release
@@ -80,7 +82,7 @@ PYTHON_ARGS_FOR_INSTALL=(
     --no-build-isolation
     --no-deps
     --config-settings="rapidsai.disable-cuda=true"
-    --config-settings="rapidsai.matrix-entry=cuda=${RAPIDS_CUDA_VERSION};cuda_suffixed=false;use_cuda_wheels=false"
+    --config-settings="rapidsai.matrix-entry=cuda=${CUDA_VERSION};cuda_suffixed=false;use_cuda_wheels=false"
 )
 
 # Set defaults for vars that may not have been defined externally

From bf3ab31b17ac0b277283af6420e2e9f3a7ab67df Mon Sep 17 00:00:00 2001
From: Kyle Edwards <kyedwards@nvidia.com>
Date: Fri, 7 Aug 2026 14:48:24 -0400
Subject: [PATCH 2/4] Check nvcc output

---
 build.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/build.sh b/build.sh
index 86c29890b044..c695521da495 100755
--- a/build.sh
+++ b/build.sh
@@ -64,6 +64,10 @@ CUDF_JAR_JAVA_BUILD_DIR="$REPODIR/java/target"
 BUILD_DIRS="${LIB_BUILD_DIR} ${CUDF_BUILD_DIR} ${DASK_CUDF_BUILD_DIR} ${KAFKA_LIB_BUILD_DIR} ${CUDF_KAFKA_BUILD_DIR} ${CUSTREAMZ_BUILD_DIR} ${CUDF_JAR_JAVA_BUILD_DIR} ${PYLIBCUDF_BUILD_DIR} ${STREAMING_LIB_BUILD_DIR}"
 
 CUDA_VERSION="$(nvcc --version | sed -E -n 's/^.*release ([0-9]+\.[0-9]+).*$/\1/p')"
+if [[ -z "$CUDA_VERSION" ]]; then
+  echo "Could not determine CUDA version. Please make sure your \$PATH contains a valid nvcc."
+  exit 1
+fi
 
 # Set defaults for vars modified by flags to this script
 VERBOSE_FLAG=""

From 8ac67d79742c90b1460bf6178bc3e93934b687f3 Mon Sep 17 00:00:00 2001
From: Kyle Edwards <kyedwards@nvidia.com>
Date: Fri, 7 Aug 2026 14:49:04 -0400
Subject: [PATCH 3/4] Indent

---
 build.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/build.sh b/build.sh
index c695521da495..0f509abc12d6 100755
--- a/build.sh
+++ b/build.sh
@@ -65,8 +65,8 @@ BUILD_DIRS="${LIB_BUILD_DIR} ${CUDF_BUILD_DIR} ${DASK_CUDF_BUILD_DIR} ${KAFKA_LI
 
 CUDA_VERSION="$(nvcc --version | sed -E -n 's/^.*release ([0-9]+\.[0-9]+).*$/\1/p')"
 if [[ -z "$CUDA_VERSION" ]]; then
-  echo "Could not determine CUDA version. Please make sure your \$PATH contains a valid nvcc."
-  exit 1
+    echo "Could not determine CUDA version. Please make sure your \$PATH contains a valid nvcc."
+    exit 1
 fi
 
 # Set defaults for vars modified by flags to this script

From 73840f9c1fa1d626375eb08b93644e7eb9c40e43 Mon Sep 17 00:00:00 2001
From: Kyle Edwards <kyedwards@nvidia.com>
Date: Fri, 7 Aug 2026 15:18:34 -0400
Subject: [PATCH 4/4] Use RAPIDS_CUDA_VERSION by default

---
 build.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/build.sh b/build.sh
index 0f509abc12d6..d921f16472d2 100755
--- a/build.sh
+++ b/build.sh
@@ -63,9 +63,9 @@ CUDF_JAR_JAVA_BUILD_DIR="$REPODIR/java/target"
 
 BUILD_DIRS="${LIB_BUILD_DIR} ${CUDF_BUILD_DIR} ${DASK_CUDF_BUILD_DIR} ${KAFKA_LIB_BUILD_DIR} ${CUDF_KAFKA_BUILD_DIR} ${CUSTREAMZ_BUILD_DIR} ${CUDF_JAR_JAVA_BUILD_DIR} ${PYLIBCUDF_BUILD_DIR} ${STREAMING_LIB_BUILD_DIR}"
 
-CUDA_VERSION="$(nvcc --version | sed -E -n 's/^.*release ([0-9]+\.[0-9]+).*$/\1/p')"
+CUDA_VERSION="${RAPIDS_CUDA_VERSION:-$(nvcc --version | sed -E -n 's/^.*release ([0-9]+\.[0-9]+).*$/\1/p')}"
 if [[ -z "$CUDA_VERSION" ]]; then
-    echo "Could not determine CUDA version. Please make sure your \$PATH contains a valid nvcc."
+    echo "Could not determine CUDA version. Please set RAPIDS_CUDA_VERSION or make sure your \$PATH contains a valid nvcc."
     exit 1
 fi