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+# Checks for OpenGL and GLUT support
+#
+# Copyright © 2015 Open Microscopy Environment / University of Dundee
+# Copyright © 2021 Roger Leigh <rleigh@codelibre.net>
+# Written by Roger Leigh <rleigh@codelibre.net>
+#
+# Permission to use, copy, modify, distribute, and sell this software and
+# its documentation for any purpose is hereby granted without fee, provided
+# that (i) the above copyright notices and this permission notice appear in
+# all copies of the software and related documentation, and (ii) the names of
+# Sam Leffler and Silicon Graphics may not be used in any advertising or
+# publicity relating to the software without the specific, prior written
+# permission of Sam Leffler and Silicon Graphics.
+#
+# THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+# WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+#
+# IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
+# ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+# OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+# LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+
+# OpenGL and GLUT
+set(OpenGL_GL_PREFERENCE LEGACY)
+
+find_package(OpenGL COMPONENTS OpenGL)
+find_package(GLUT)
+
+set(HAVE_OPENGL FALSE)
+if(OPENGL_FOUND AND OPENGL_GLU_FOUND AND GLUT_FOUND)
+ set(HAVE_OPENGL TRUE)
+endif()
+
+# Purely to satisfy the generated headers:
+check_include_file(GL/gl.h HAVE_GL_GL_H)
+check_include_file(GL/glu.h HAVE_GL_GLU_H)
+check_include_file(GL/glut.h HAVE_GL_GLUT_H)
+check_include_file(GLUT/glut.h HAVE_GLUT_GLUT_H)
+check_include_file(OpenGL/gl.h HAVE_OPENGL_GL_H)
+check_include_file(OpenGL/glu.h HAVE_OPENGL_GLU_H)