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diff --git a/var/spack/repos/builtin/packages/opengl/package.py b/var/spack/repos/builtin/packages/opengl/package.py
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+++ b/var/spack/repos/builtin/packages/opengl/package.py
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+# Copyright 2013-2018 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 Opengl(Package):
+    """Placeholder for external OpenGL libraries from hardware vendors"""
+
+    homepage = "https://www.opengl.org/"
+
+    provides('gl@:4.5', when='@4.5:')
+    provides('gl@:4.4', when='@4.4:')
+    provides('gl@:4.3', when='@4.3:')
+    provides('gl@:4.2', when='@4.2:')
+    provides('gl@:4.1', when='@4.1:')
+    provides('gl@:3.3', when='@3.3:')
+
+    # Override the fetcher method to throw a useful error message;
+    # fixes GitHub issue (#7061) in which this package threw a
+    # generic, uninformative error during the `fetch` step,
+    @property
+    def fetcher(self):
+        msg = """This package is intended to be a placeholder for
+        system-provided OpenGL libraries from hardware vendors.  Please
+        download and install OpenGL drivers/libraries for your graphics
+        hardware separately, and then set that up as an external package.
+        An example of a working packages.yaml:
+
+        packages:
+          opengl:
+            paths:
+              opengl@4.5.0: /opt/opengl
+            buildable: False
+
+        In that case, /opt/opengl/ should contain these two folders:
+
+        include/GL/       (opengl headers, including "gl.h")
+        lib               (opengl libraries, including "libGL.so")
+
+        On Apple Darwin (e.g., OS X, macOS) systems, this package is
+        normally installed as part of the XCode Command Line Tools in
+        /usr/X11R6, so a working packages.yaml would be
+
+        packages:
+          opengl:
+            paths:
+              opengl@4.1: /usr/X11R6
+            buildable: False
+
+        In that case, /usr/X11R6 should contain
+
+        include/GL/      (OpenGL headers, including "gl.h")
+        lib              (OpenGL libraries, including "libGL.dylib")
+
+        On OS X/macOS, note that the version of OpenGL provided
+        depends on your hardware. Look at
+        https://support.apple.com/en-us/HT202823 to see what version
+        of OpenGL your Mac uses."""
+        raise InstallError(msg)
+
+    @property
+    def libs(self):
+        for dir in ['lib64', 'lib']:
+            libs = find_libraries('libGL', join_path(self.prefix, dir),
+                                  shared=True, recursive=False)
+            if libs:
+                return libs