diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8fbe8af3782..96cebf668e7 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -313,9 +313,7 @@ jobs:
           cython boost-cpp fmt eigen yaml-cpp h5py pandas libgomp openblas pytest
       - name: Build Cantera
         run: |
-          scons build extra_inc_dirs=$CONDA_PREFIX/include:$CONDA_PREFIX/include/eigen3 \
-          extra_lib_dirs=$CONDA_PREFIX/lib system_fmt=y system_eigen=y system_yamlcpp=y \
-          system_sundials=y blas_lapack_libs='lapack,blas' -j2 VERBOSE=True debug=n \
+          scons build blas_lapack_libs='lapack,blas' -j2 VERBOSE=True debug=n \
           optimize_flags='-O3 -ffast-math -fno-finite-math-only'
       - name: Test Cantera
         run: scons test show_long_tests=yes verbose_tests=yes