parallelio: fix install_name for on macos (#45567)

var/spack/repos/builtin/packages/parallelio/package.py

@@ -70,6 +70,11 @@ class Parallelio(CMakePackage):
     # Allow argument mismatch in gfortran versions > 10 for mpi library compatibility
     patch("gfortran.patch", when="@:2.5.8 +fortran %gcc@10:")
 
+    @run_after("install", when="platform=darwin")
+    def darwin_install_name(self):
+        # The shared library is not installed correctly on Darwin; fix this
+        fix_darwin_install_name(self.prefix.lib)
+
     def cmake_args(self):
         define = self.define
         define_from_variant = self.define_from_variant