Last fix didn't work, creating new branch.

rtdata/CMakeLists.txt

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+
+file (GLOB PROFILEFILES "profiles/*.pp3")
+file (GLOB LANGUAGEFILES "languages/*")
+file (GLOB SOUNDFILES "sounds/*")
+file (GLOB INPUTICCFILES "iccprofiles/input/*")
+file (GLOB OUTPUTICCFILES "iccprofiles/output/*")
+# THEMEDIR includes subfolders for image resources for some themes; doing the normal glob won't work.
+set (THEMEDIR "themes")
+set (IMAGESDIR "images")
+
+if (WIN32)
+    set(OPTIONSFILE "options/options.win")
+elseif (APPLE)
+    set(OPTIONSFILE "options/options.osx")
+else (WIN32)
+    set(OPTIONSFILE "options/options.lin")
+endif (WIN32)
+
+if (UNIX)
+    configure_file (${CMAKE_CURRENT_SOURCE_DIR}/icons/rawtherapee.desktop.in ${CMAKE_CURRENT_BINARY_DIR}/rawtherapee.desktop)
+    install (FILES ${CMAKE_CURRENT_BINARY_DIR}/rawtherapee.desktop DESTINATION ${DESKTOPDIR})
+    install (FILES ${CMAKE_CURRENT_SOURCE_DIR}/icons/hi16-app-rawtherapee.png DESTINATION ${ICONSDIR}/hicolor/16x16/apps RENAME rawtherapee.png)
+    install (FILES ${CMAKE_CURRENT_SOURCE_DIR}/icons/hi24-app-rawtherapee.png DESTINATION ${ICONSDIR}/hicolor/24x24/apps RENAME rawtherapee.png)
+    install (FILES ${CMAKE_CURRENT_SOURCE_DIR}/icons/hi32-app-rawtherapee.png DESTINATION ${ICONSDIR}/hicolor/32x32/apps RENAME rawtherapee.png)
+    install (FILES ${CMAKE_CURRENT_SOURCE_DIR}/icons/hi48-app-rawtherapee.png DESTINATION ${ICONSDIR}/hicolor/48x48/apps RENAME rawtherapee.png)
+    install (FILES ${CMAKE_CURRENT_SOURCE_DIR}/icons/hi128-app-rawtherapee.png DESTINATION ${ICONSDIR}/hicolor/128x128/apps RENAME rawtherapee.png)
+    install (FILES ${CMAKE_CURRENT_SOURCE_DIR}/icons/hi256-app-rawtherapee.png DESTINATION ${ICONSDIR}/hicolor/256x256/apps RENAME rawtherapee.png)
+endif (UNIX)
+
+install (FILES ${IMAGEFILES} DESTINATION ${DATADIR}/images)
+install (FILES ${LANGUAGEFILES} DESTINATION ${DATADIR}/languages)
+install (FILES ${PROFILEFILES} DESTINATION ${DATADIR}/profiles)
+install (FILES ${SOUNDFILES} DESTINATION ${DATADIR}/sounds)
+install (FILES ${INPUTICCFILES} DESTINATION ${DATADIR}/iccprofiles/input)
+install (FILES ${OUTPUTICCFILES} DESTINATION ${DATADIR}/iccprofiles/output)
+install (DIRECTORY ${THEMEDIR} DESTINATION ${DATADIR})
+install (DIRECTORY ${IMAGESDIR} DESTINATION ${DATADIR} FILES_MATCHING PATTERN "index.theme")
+install (DIRECTORY ${IMAGESDIR} DESTINATION ${DATADIR} FILES_MATCHING PATTERN "*.png")
+install (FILES ${OPTIONSFILE} DESTINATION ${DATADIR} PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ RENAME options)
+

rtdata/icons/rawtherapee.desktop.in

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+[Desktop Entry]
+Version=1.0
+Type=Application
+Name=RawTherapee
+GenericName=RAW image editor
+GenericName[cs]=Editor RAW obrázků
+GenericName[fr]=Éditeur d'images RAW
+Comment=The RAW converter and digital photo processing software. 
+Comment[cs]=Program pro konverzi a zpracování digitálních RAW fotografií.
+Comment[fr]=Logiciel de conversion et de traitement de photos numériques de format RAW (but de capteur).
+Exec=${BINDIR}/rawtherapee
+Icon=rawtherapee.png
+Terminal=false
+Categories=Graphics;Photography;GTK;
+
+MimeType=image/jpeg;image/png;image/tiff;image/x-adobe-dng;image/x-canon-crw;image/x-canon-cr2;image/x-fuji-raf;image/x-kodak-dcr;image/x-kodak-kdc;image/x-kodak-k25;image/x-minolta-mrw;image/x-nikon-nef;image/x-olympus-orf;image/x-panasonic-raw;image/x-pentax-pef;image/x-sony-arw;image/x-sony-srf;image/x-sony-sr2;