Use old method for installing libsupermesh

Otherwise we need to make tricky changes to firedrake-install (which
will go away anyway).

requirements-git.txt

@@ -4,4 +4,3 @@ git+https://github.com/dolfin-adjoint/pyadjoint.git#egg=pyadjoint-ad
 git+https://github.com/firedrakeproject/loopy.git@main#egg=loopy
 git+https://github.com/firedrakeproject/pytest-mpi.git@main#egg=pytest-mpi
 git+https://github.com/firedrakeproject/petsc.git@firedrake#egg=petsc
-git+https://github.com/firedrakeproject/libsupermesh.git@connorjward/pip-install2

scripts/firedrake-install

@@ -1252,6 +1252,36 @@ def build_and_install_h5py():
         log.info("No need to rebuild h5py")
 
 
+def build_and_install_libsupermesh(cc, cxx, f90, mpiexec):
+    log.info("Installing libsupermesh")
+    url = "git+https://github.com/firedrakeproject/libsupermesh.git@connorjward/pip-install2"
+    if os.path.exists("libsupermesh"):
+        changed = git_update("libsupermesh", url)
+    else:
+        git_clone(url)
+        changed = True
+    if changed:
+        with directory("libsupermesh"):
+            check_call(["git", "reset", "--hard"])
+            check_call(["git", "clean", "-f", "-x", "-d"])
+            check_call(["mkdir", "-p", "build"])
+            with directory("build"):
+                cmd = [
+                    "cmake", "..", "-DBUILD_SHARED_LIBS=ON",
+                    "-DCMAKE_INSTALL_PREFIX=" + firedrake_env,
+                    "-DMPI_C_COMPILER=" + cc,
+                    "-DMPI_CXX_COMPILER=" + cxx,
+                    "-DMPI_Fortran_COMPILER=" + f90,
+                    "-DCMAKE_Fortran_COMPILER=" + f90,
+                    "-DMPIEXEC_EXECUTABLE=" + mpiexec,
+                ]
+                check_call(cmd)
+                check_call(["make"])
+                check_call(["make", "install"])
+    else:
+        log.info("No need to rebuild libsupermesh")
+
+
 def build_and_install_pythonocc():
     log.info("Installing pythonocc-core")
     url = "git+https://github.com/tpaviot/pythonocc-core.git@595b0a4e8e60e8d6011bea0cdb54ac878efcfcd2"
@@ -1409,7 +1439,7 @@ def create_compiler_env(cc, cxx, f90):
         env["CXX"] = cxx
     if f90:
         env["MPIF90"] = f90
-        env["MPI_Fortran_COMPILER"] = f90
+        env["MPI_C_COMPILER"] = f90
         env["F90"] = f90
 
     return env
@@ -1658,8 +1688,6 @@ run_pip(["install", "-U", "hatch"])
 run_pip(["install", "-U", "editables"])
 run_pip(["install", "-U", "pip"])
 run_pip(["install", "-U", "wheel"])
-run_pip(["install", "-U", "scikit-build-core"])
-run_pip(["install", "-U", "rtree>=1.2"])
 
 # Extra numpy dependendencies, see
 # https://github.com/numpy/numpy/blob/main/pyproject.toml
@@ -1849,6 +1877,9 @@ if mode == "install":
                 install(p+"/")
             sys.path.append(os.getcwd() + "/" + p)
 
+    with environment(**compiler_env):
+        build_and_install_libsupermesh(cc, cxx, f90, mpiexec)
+
     with pipargs("--no-deps"), environment(**compiler_env, **link_env):
         install("firedrake/")
 
@@ -2028,6 +2059,9 @@ Please consider updating your PETSc manually.
             else:
                 install(p+"/")
 
+        with environment(**compiler_env):
+            build_and_install_libsupermesh(cc, cxx, f90, mpiexec)
+
         with pipargs("--no-deps"), environment(**compiler_env, **link_env):
             install("firedrake/")