--- a/src/pfsglview/CMakeLists.txt~	2017-11-13 11:38:26.000000000 -0600
+++ a/src/pfsglview/CMakeLists.txt	2019-09-19 10:07:11.350642598 -0500
@@ -1,5 +1,5 @@
 
-include_directories ("${PROJECT_BINARY_DIR}/" "${PROJECT_SOURCE_DIR}/src/pfs" ${OPENGL_INCLUDE_DIRS}  ${GLUT_INCLUDE_DIRS})
+include_directories ("${PROJECT_BINARY_DIR}/" "${PROJECT_SOURCE_DIR}/src/pfs" ${OPENGL_INCLUDE_DIRS} ${FreeGLUT_INCLUDE_DIRS})
 if( NOT HAS_GETOPT )
 	include_directories ("${GETOPT_INCLUDE}")
 endif( NOT HAS_GETOPT )
@@ -11,8 +11,8 @@
 
 add_executable(pfsglview pfsglview.cpp picture_io.cpp module.cpp m_histogram.cpp m_status.cpp m_on_screen_display.cpp)
 
-# TODO: Use ${GLUT_LIBRARY} instead.
-target_link_libraries(pfsglview ${OPENGL_LIBRARIES} ${GLUT_glut_LIBRARY} pfs)
+# TODO: Use ${FreeGLUT_LIBRARY} instead.
+target_link_libraries(pfsglview ${OPENGL_LIBRARIES} -lglut pfs)
 
 install (TARGETS pfsglview DESTINATION bin)
 install (FILES pfsglview.1 DESTINATION ${MAN_DIR})
--- a/src/CMakeLists.txt~	2017-11-13 11:38:28.000000000 -0600
+++ a/src/CMakeLists.txt	2019-09-19 10:19:30.051372391 -0500
@@ -18,9 +18,9 @@
     add_subdirectory (matlab)
 endif( MATLAB_FOUND )
 
-if( OPENGL_FOUND AND GLUT_FOUND )
+if( OPENGL_FOUND AND FreeGLUT_FOUND )
     add_subdirectory (pfsglview)
-endif( OPENGL_FOUND AND GLUT_FOUND )
+endif( OPENGL_FOUND AND FreeGLUT_FOUND )
 
 if( WITH_HDRVC )
 	add_subdirectory (hdrvc)
--- a/CMakeLists.txt~	2017-11-13 11:38:18.000000000 -0600
+++ a/CMakeLists.txt	2019-09-19 10:36:27.025771833 -0500
@@ -221,17 +221,17 @@
 find_path(OPENGL_INCLUDE_DIR GL/gl.h )
 
 find_package(OpenGL )
-find_package(GLUT )
+find_package(FreeGLUT )
 
 if( NOT OPENGL_FOUND )
 	MESSAGE( STATUS "OpenGL not found. The following command will not be
 compiled: pfsglview. " )
 endif( NOT OPENGL_FOUND )
 
-if( NOT GLUT_FOUND )
+if( NOT FreeGLUT_FOUND )
 	MESSAGE( STATUS "GLUT not found. The following command will not be
 compiled: pfsglview. " )
-endif( NOT GLUT_FOUND )
+endif( NOT FreeGLUT_FOUND )
 
 endif( WITH_pfsglview )
 
--- a/src/pfsglview/glenv.h~	2017-11-13 11:38:26.000000000 -0600
+++ a/src/pfsglview/glenv.h	2019-09-19 10:43:41.179049107 -0500
@@ -11,7 +11,7 @@
  #if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
    #include <windef.h>
  #endif
-#include "GL/glut.h"
+#include "GL/freeglut.h"
 #include "GL/gl.h"
 #include "GL/glu.h"
 #include "GL/glext.h"