From 1cb51b81f40d7c67b14b2f603d8f6685cce31aad Mon Sep 17 00:00:00 2001
From: Yashas Ambati <yashas.amb@gmail.com>
Date: Wed, 26 Feb 2025 10:38:00 -0500
Subject: [PATCH] Use sysctl to get number of CPUs if on MacOS

---
 build_tools/wheels/cibw_before_all.sh | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/build_tools/wheels/cibw_before_all.sh b/build_tools/wheels/cibw_before_all.sh
index 1c1d13581..4f0f33f16 100644
--- a/build_tools/wheels/cibw_before_all.sh
+++ b/build_tools/wheels/cibw_before_all.sh
@@ -49,5 +49,12 @@ cmake $PROJECT_DIR \
     -DCMAKE_INSTALL_PREFIX=$PROJECT_DIR/gtsam_install
 
 cd $PROJECT_DIR/build/python
-make -j $(nproc) install
-make -j $(nproc) python-stubs
+
+if [ "$(uname)" == "Linux" ]; then
+    make -j $(nproc) install
+    make -j $(nproc) python-stubs
+elif [ "$(uname)" == "Darwin" ]; then
+    make -j $(sysctl -n hw.logicalcpu) install
+    make -j $(sysctl -n hw.logicalcpu) python-stubs
+fi
+