Move location of pybind11 import in setup.py

.github/workflows/macos.yml

@@ -5,7 +5,7 @@ on:
   schedule:
     # '*' is a special character in YAML, so string must be quoted
     - cron: "0 4 * * WED"
-  workflow_dispatch: ~
+  workflow_dispatch:
 
 jobs:
   mac-os-build:
@@ -29,7 +29,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: "3.10"
 
       - name: Create virtualenv
         run: |
@@ -45,9 +45,7 @@ jobs:
       - name: Install minimal PETSc
         run: |
           source fenicsx/bin/activate
-          curl -L -O http://ftp.mcs.anl.gov/pub/petsc/release-snapshots/petsc-lite-3.18.3.tar.gz
-          mkdir petsc
-          tar -xf petsc-lite-3.18.3.tar.gz -C petsc --strip-components=1
+          git clone -b release https://gitlab.com/petsc/petsc.git petsc
           cd petsc
           python ./configure \
             --with-64-bit-indices=no \
@@ -56,14 +54,13 @@ jobs:
             --with-scalar-type=real \
             --with-shared-libraries \
             --with-scalar-type=real \
-            --with-make-np=3 \
             --download-bison \
             --download-metis \
             --download-ptscotch
           make all
           cd src/binding/petsc4py
           PETSC_DIR=$GITHUB_WORKSPACE/petsc PETSC_ARCH=arch-darwin-c-opt pip3 install --no-cache-dir .
- 
+
       - name: Install Basix
         run: |
           source fenicsx/bin/activate
@@ -79,10 +76,8 @@ jobs:
           source fenicsx/bin/activate
           python -m pip install git+https://github.com/FEniCS/ffcx.git
 
-      - uses: actions/checkout@v3
-        with:
-          path: dolfinx
-          ref: main
+      - name: Checkout DOLFINx
+        uses: actions/checkout@v3
 
       - name: Build and install DOLFINx C++ library
         run: |

python/setup.py

@@ -4,7 +4,6 @@
 import sys
 import sysconfig
 
-import pybind11
 from setuptools import Extension, setup
 from setuptools.command.build_ext import build_ext
 
@@ -51,6 +50,8 @@ def build_extension(self, ext):
         cmake_args += ['-DCMAKE_BUILD_TYPE=' + cfg]
 
         env = os.environ.copy()
+
+        import pybind11
         env['pybind11_DIR'] = pybind11.get_cmake_dir()
 
         if not os.path.exists(self.build_temp):