try exporting FC

Author: ewu63

.github/environment.yml

@@ -5,11 +5,12 @@ dependencies:
   - swig
   - meson >=1.3.2
   - meson-python
-  - compilers
+  - c-compiler
+  - cxx-compiler
   - pip
   - setuptools
   - build
-  - flang=5
+  - flang=20
   - libpgmath
 # runtime
   - packaging

.github/workflows/windows-build.yml

@@ -36,6 +36,8 @@ jobs:
           :: debug - list environment vars
           set
 
+          set FC=flang.exe
+
           python -m build -n -x .
 
           pip install --no-deps --no-index --find-links dist pyoptsparse