Fix cmake variable case

CMake finders have the option to set `<PackageName>_ROOT`
to specify a root prefix to search. `<PackageName>` is case sensitive so
must match exactly what is passed to `find_package`.

CMakePresets.json

@@ -18,8 +18,8 @@
                 "USE_PYTHON_DYNAMIC_LIB": "OFF",
                 "Qt5_DIR": "$env{CONDA_PREFIX}/lib/cmake/qt5",
                 "HDF5_ROOT": "$env{CONDA_PREFIX}",
-                "OPENSSL_ROOT": "$env{CONDA_PREFIX}"
+                "OpenSSL_ROOT": "$env{CONDA_PREFIX}"
             }
         }
     ]
-}
+}
\ No newline at end of file

buildconfig/CMake/DarwinSetup.cmake

@@ -124,9 +124,9 @@ set(PLUGINS_DIR plugins)
 # Mac-specific installation setup
 # ##############################################################################
 # use homebrew OpenSSL package
-if(NOT OPENSSL_ROOT)
-  set(OPENSSL_ROOT /usr/local/opt/openssl)
-endif(NOT OPENSSL_ROOT)
+if(NOT OpenSSL_ROOT)
+  set(OpenSSL_ROOT /usr/local/opt/openssl)
+endif()
 
 if(NOT HDF5_ROOT)
     set(HDF5_ROOT /usr/local/opt/hdf5) # Only for homebrew!