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diff --git a/var/spack/repos/builtin/packages/ecoslim/package.py b/var/spack/repos/builtin/packages/ecoslim/package.py
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+++ b/var/spack/repos/builtin/packages/ecoslim/package.py
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+# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class Ecoslim(CMakePackage):
+    """EcoSLIM is a Lagrangian, particle-tracking code that simulates
+    advective and diffusive movement of water parcels.  EcoSLIM
+    integrates seamlessly with ParFlow-CLM."""
+
+    homepage = "https://github.com/reedmaxwell/EcoSLIM"
+    url      = "https://github.com/reedmaxwell/EcoSLIM/archive/refs/tags/v1.3.tar.gz"
+    git      = "https://github.com/reedmaxwell/EcoSLIM.git"
+
+    maintainers = ['reedmaxwell', 'lecondon', 'smithsg84']
+
+    version('1.3', sha256='b532e570b4767e4fa84123d8773732150679e8e3d7fecd5c6e99fb1d4dc57b84')
+    version('master', branch='master')
+
+    def cmake_args(self):
+        """Populate cmake arguments for EcoSLIM."""
+        return []