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How to use Rcpp in Qt (with Mac) [Almost Solved]?

  • There is nothing as "installing it via Qt". If you have installed it in R Studio then you just need to locate the R library and the header files I mentioned above. Then adjust the paths in your *.pro file.

  • Thanks! I understand.

    Well in R Studio I identified the R library with ".Library"and I got:

    [1] "/Library/Frameworks/R.framework/Resources/library"

    In combination with your suggestion I tried this:
    INCLUDEPATH += /Users/xy/share/R/include
    INCLUDEPATH += /Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include
    LIBS += -L/Users/xy/lib -lR
    but it was not working...

  • Sorry, but I can't help you with Mac OS. :-(

  • Okay! Thank you very much for your help!

  • You're welcome!

  • Lifetime Qt Champion

    Hi and welcome to devnet,

    Try with -framework R in place of -lR

  • Thanks!

    Well, now I have got:
    INCLUDEPATH += /Users/xy/share/R/include
    INCLUDEPATH += /Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include
    LIBS += -L/Users/xy/Library -framework R

    but I still get:
    'Rcpp.h' file not found

    also if change to:
    LIBS += -L/Users/xy/Library/Frameworks/R.framework/

    and when I typed in R Studio:

    I got:

    Sorry, but I do not find the mistake. Any idea?

  • Lifetime Qt Champion

    It depends on how you wrote your includes

    What mistake are you thinking about ?

  • I wrote my include: #include "Rcpp.h" in mainwindow.cpp.
    It is not conflicting with: #include "math.h", or?

    And it displays: directory not found for: LIBS += -L/Users/xy/Library/Frameworks/R.framework/ and also for: LIBS += -L/Users/xy/Library -framework R

  • Lifetime Qt Champion

    To add a path for frameworks you should user -F /Users/xy/Library/Frameworks/
    The includes are generally in fwname.framework/Headers

  • Hi!

    Sorry, but Qt still does not find the "Rccp.h" file. I tried to include #include "Rcpp.h" in mainwindow.cpp or in mainwindow.h. Or should I include it in main.cpp?

    and additionally I wrote in the .pro-file:
    HEADERS += mainwindow.h

    FORMS += mainwindow.ui

    INCLUDEPATH += /Users/xy/share/R/include
    INCLUDEPATH += /Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include
    LIBS += -L/Users/xy/Library/Frameworks/R.framework/
    INCLUDEPATH += -F/Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include

    and I tried: INCLUDEPATH += "/Users/.../include" using: "..." but same result.

    In RStudio it gives me:

    [1] "/Library/Frameworks/R.framework/Resources/library"
    [1] "/Users/xy"

    So I combined: "/Users/xy/Library/Frameworks/R.framework/Resources/library"

    Unfortunately, always the same result 'Rcpp.h' not found.

    Even they: found
    "/Library/Frameworks/R.framework/Resources/library" should be alright!

    Has got anyone an idea?

    I just want to use 'Rcpp.h' (which I already installed via RStudio, where it loads and runs without any problems) in Qt with a Mac. :-)

  • Has anyone an idea to get Rcpp.h
    running in Qt with a Mac?

  • Hi again!
    Can you open the directory "/Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include" with a file manager? Does it contain the file "Rcpp.h" ?

  • Hi,
    I tried to re-install Rcpp.h:

    • installing source package ‘Rcpp’ ...
      ** Paket ‘Rcpp’ erfolgreich entpackt und MD5 Summen überprüft
      ** libs
      clang++ -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include/ -I/usr/local/include -I/usr/local/include/freetype2 -I/opt/X11/include
      clang++ -dynamiclib -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress -L/Library/Frameworks/R.framework/Resources/lib -L/usr/local/lib -o Date.o Module.o Rcpp_init.o api.o attributes.o barrier.o -F/Library/Frameworks/R.framework/.. -framework R -Wl,-framework -Wl,CoreFoundation
      installing to /Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rcpp/libs
      ** R
      ** inst
      ** preparing package for lazy loading
      ** help
      *** installing help indices
      ** building package indices
      ** installing vignettes
      ** testing if installed package can be loaded
    • DONE (Rcpp)

    then I used:
    INCLUDEPATH += /Users/xy/Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rcpp/include
    LIBS += -I/Library/Frameworks/R.framework/Resources/include
    LIBS += -F/Library/Frameworks/R.framework/Resources/include

    It still does not run!

  • Hallo :-)

    -o Date.o Module.o Rcpp_init.o api.o attributes.o

    I see that some object code files have been installed. But are you really sure that the file "Rcpp.h" exists in "/Users/xy/Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rcpp/include" ? Maybe the Rcpp project has been split in two separate packages: One package only for software that uses Rcpp binaries and a second package for developers that includes all the header files (so called "-dev" package)?

  • Hi Wieland!

    Thanks! Yes it exists!

    I checked (in the Terminal): cd /Library/Frameworks/R.framework/Resources/library
    and then "ls"

    And it is there: Rcpp

    Then i changed to: cd Rcpp and "ls" gave me:
    DESCRIPTION NEWS.Rd announce help prompt
    INDEX R discovery html skeleton
    Meta README doc

    This was initially downloaded from:

    And I changed:
    INCLUDEPATH += /Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include
    LIBS += -I/Users/xy/Library/ -framework R
    in the .Pro-file.

    Any ideas?

  • Sorry for being pedantic on this (I'm only as pedantic as the compiler is ;-) ). You said:

    cd /Library/Frameworks/R.framework/Resources/library
    And it is there: Rcpp

    That is a directory. Where exactly is the file Rcpp.h?

  • Hi Wieland, thanks for your hint!

    Finally, I found Rcpp.h and I managed to include it with the correct path and now Rcpp.h is found!
    Here the two steps, which helped me to solve it:

    1. QMAKE_LFLAGS += -I /Library/Frameworks/R.framework/Resources/library/Rcpp/ # use qmake and then uncomment it
    2. INCLUDEPATH += -I /Library/Frameworks/R.framework/Resources/library/Rcpp/include
      Remark: Very important was to change the path directly to /Library/... and include "-I".

    This first part of the problem is solved!

    But now, i get the new error message: framework not found R.

    I use: LIBS += -framework R
    in the .Pro-file (as suggested here:
    I also tried: LIBS += -framework -lR
    it also did not work.

    Here is the error message:

    ld: framework not found R
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    make: *** [] Error 1
    19:13:17: Der Prozess "/usr/bin/make" wurde mit dem Rückgabewert 2 beendet.
    Fehler beim Erstellen/Deployment des Projekts xy (Kit: Desktop Qt 5.4.1 clang 64bit)
    Bei der Ausführung von Schritt "Make"

    I hope this second part can also be solved. Then it should work! Any suggestions?

  • Lifetime Qt Champion


    Did you add -F/Library/Frameworks to your pro file ? It's the equivalent to -L for libraries

  • Yes!

    Well, the problem removed, but this came up:
    Undefined symbols for architecture x86_64:
    "_REprintf", referenced from:
    Rcpp::Rstreambuf<false>::xsputn(char const*, long) in mainwindow.o
    Rcpp::Rstreambuf<false>::overflow(int) in mainwindow.o
    "_R_FlushConsole", referenced from:
    Rcpp::Rstreambuf<false>::sync() in mainwindow.o
    Rcpp::Rstreambuf<true>::sync() in mainwindow.o
    "_Rprintf", referenced from:
    Rcpp::Rstreambuf<true>::xsputn(char const*, long) in mainwindow.o
    Rcpp::Rstreambuf<true>::overflow(int) in mainwindow.o
    ld: symbol(s) not found for architecture x86_64
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    make: *** [] Error 1
    23:51:38: Der Prozess "/usr/bin/make" wurde mit dem Rückgabewert 2 beendet.
    Fehler beim Erstellen/Deployment des Projekts xy (Kit: Desktop Qt 5.4.1 clang 64bit)
    Bei der Ausführung von Schritt "Make"

    Especially: symbol(s) not found for architecture x86_64
    does not disappear after several tries.

    it was described that Xcode and Mac Os were not linked properly.

    QMAKE_MAC_SDK = macosx10.9
    was suggested. Either it failed, or: Project ERROR: Could not resolve SDK path for 'macosx10.xy'
    was displayed!

    Well yet not solved... :-)

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