Include "Library/include" in include path on Windows

Author: eriknw

.github/workflows/test.yml

@@ -14,8 +14,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
-        python-version: [3.7, 3.8, 3.9]
+        os: ["windows-latest"]
+        python-version: [3.9]
+        # os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        # python-version: [3.7, 3.8, 3.9]
     steps:
     - name: Checkout
       uses: actions/checkout@v2

suitesparse_graphblas/build.py

@@ -10,11 +10,15 @@
 with open(os.path.join(thisdir, "source.c")) as f:
     source = f.read()
 
+include_dirs = [os.path.join(sys.prefix, "include")]
+if sys.platform == "win32":
+    include_dirs.append(os.path.join(sys.prefix, "Library", "include"))
+
 ffibuilder.set_source(
     "suitesparse_graphblas._graphblas",
     source,
     libraries=["graphblas"],
-    include_dirs=[os.path.join(sys.prefix, "include")],
+    include_dirs=include_dirs,
 )
 
 header = "suitesparse_graphblas.h"