--- frontend/gtkmm/CMakeLists.txt.orig	2018-03-30 09:33:27 UTC
+++ frontend/gtkmm/CMakeLists.txt
@@ -126,11 +126,11 @@ install(FILES    ${PROJECT_SOURCE_DIR}/.
 #     there anyway.
 #   - gtk-update-icon-cache is broken and only works half of the time.
 
-if(APPLE)
+#if(APPLE)
   set(ICON_PREFIX "${CMAKE_INSTALL_PREFIX}")
-else()
-  set(ICON_PREFIX "/usr")
-endif()
+#else()
+#  set(ICON_PREFIX "/usr")
+#endif()
 
 #set(ICON_THEME ${ICON_PREFIX}/share/icons/hicolor/index.theme)
 #if(EXISTS "${ICON_THEME}")
@@ -144,9 +144,9 @@ install(FILES    ${PROJECT_SOURCE_DIR}/.
 install(FILES    ${PROJECT_SOURCE_DIR}/../../images/256x256/cadabra2-gtk.png   DESTINATION ${ICON_PREFIX}/share/icons/hicolor/256x256/apps)
 install(FILES    ${PROJECT_SOURCE_DIR}/../../images/cadabra2-gtk.svg           DESTINATION ${ICON_PREFIX}/share/icons/hicolor/scalable/apps)
 install(FILES    ${PROJECT_SOURCE_DIR}/../../config/cadabra2-gtk.desktop       DESTINATION ${ICON_PREFIX}/share/applications)
-install(CODE     "execute_process(COMMAND touch ${ICON_PREFIX}/share/icons/hicolor/icon-theme.cache)")
-install(CODE     "execute_process(COMMAND gtk-update-icon-cache-3.0 ${ICON_PREFIX}/share/icons/hicolor)")
-install(CODE     "execute_process(COMMAND chmod go+r ${ICON_PREFIX}/share/icons/hicolor/icon-theme.cache)")
+#install(CODE     "execute_process(COMMAND touch ${ICON_PREFIX}/share/icons/hicolor/icon-theme.cache)")
+#install(CODE     "execute_process(COMMAND gtk-update-icon-cache-3.0 ${ICON_PREFIX}/share/icons/hicolor)")
+#install(CODE     "execute_process(COMMAND chmod go+r ${ICON_PREFIX}/share/icons/hicolor/icon-theme.cache)")
 
 # Install shared libraries on Windows. 
 # https://stackoverflow.com/questions/32662215/how-do-you-install-gtk-3-0-on-windows