That is unfortunately true. But due to the fact that it needs to interface with the qalculate library on the system there is currently no other way to make it work.

Sorry, I have never heard of ocs before. Looks like this is currently not supported. A list of supported ways to install is listed here: https://github.com/dschopf/plasma-applet-qalculate/blob/master/README.md

I'll see that but ocs-url is offer to install this add-ons on this page right now: " *Needs ocs-url or ocs-store to install things"

Unfortunately there is no way to disable this feature for individual packages. It will work for script addons, but Qalculate! needs to compile native libraries, which is not supported. Sorry for the trouble. Which distribution are you using?

It's difficult to guess what the problem might be. Are there any errors when installing the plugin? Maybe you could open an issue on Github with some more details like which distribution, compiler and KDE version you are using.

Nevermind. My fault. Forgot to read the bit where you said that libqalculate 2.5 or higher is required. Thanks!!

That part about the requirement of libqalculate v2.5 only refers to the new feature of using the two's complement representation for negative numbers. Apart from that the latest version should hopefully work with all (recent) versions of libqalculate (including v2.2). The error message you receive looks like an ABI incompatibility between libqalculate and the plugin. If possible please open a bug report on the Github page, which is much better suited to discuss such issues.

This looks like a version conflict. When you use libqalculate 2.0.0 it should not try to link stopPrintControl(). How did you install the libqalculate? Manually or with a package manager? What does the output of the cmake command say. It should say something like this: -- Checking for module 'libqalculate>=0.9.8' -- Found libqalculate, version 2.4.0

123

I built it all from source repositories I tried qalculate-0.4.0 that time Compiling any of both 2.0.0 or 2.4.0 libqalculate run smoothly with ./autogen.sh (if needed) ./configure make make install (as root) cmake:: ~/setups/pkg/qalculate-0.4.0/build$ cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Release -DKDE_INSTALL_LIBDIR=lib -DKDE_INSTALL_USE_QT_SYS_PATHS=ON -- The C compiler identification is GNU 6.3.0 -- The CXX compiler identification is GNU 6.3.0 -- Check for working C compiler: /usr/bin/cc -- Check for working C compiler: /usr/bin/cc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done -- Check for working CXX compiler: /usr/bin/c++ -- Check for working CXX compiler: /usr/bin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done -- Looking for __GLIBC__ -- Looking for __GLIBC__ - found -- Performing Test _OFFT_IS_64BIT -- Performing Test _OFFT_IS_64BIT - Success -- Found PkgConfig: /usr/bin/pkg-config (found version "0.29") -- Found Readline: /usr/include -- Checking for module 'libqalculate>=0.9.8' -- Found libqalculate, version 2.0.0 <============ or 2.4.0 instead -- Configuring done -- Generating done -- Build files have been written to: /_path_/setups/pkg/qalculate-0.4.0/build continu

then make:: ~/setups/pkg/qalculate-0.4.0/build$ make Scanning dependencies of target org.kde.plasma.qalculate-metadata-json [ 16%] Generating org.kde.plasma.qalculate-metadata.json Unknown property type for key "X-KDE-ParentApp" -> falling back to string Unknown property type for key "X-Plasma-API" -> falling back to string Unknown property type for key "X-Plasma-MainScript" -> falling back to string Unknown property type for key "X-Plasma-RemoteLocation" -> falling back to string Generated "/_path_/setups/pkg/qalculate-0.4.0/build/org.kde.plasma.qalculate-metadata.json" [ 16%] Built target org.kde.plasma.qalculate-metadata-json Scanning dependencies of target plasmoidplugin_automoc [ 33%] Automatic moc for target plasmoidplugin Generating moc source plasmoidplugin_automoc.dir/moc_plasmoidplugin_DZ66HZV5Z3E2K4.cpp Generating moc source plasmoidplugin_automoc.dir/moc_qwrapper_S2JPYLPKINLUVR.cpp Generating moc compilation plasmoidplugin_automoc.cpp [ 33%] Built target plasmoidplugin_automoc Scanning dependencies of target plasmoidplugin [ 50%] Building CXX object plugin/CMakeFiles/plasmoidplugin.dir/plasmoidplugin.cpp.o [ 66%] Building CXX object plugin/CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o [ 83%] Building CXX object plugin/CMakeFiles/plasmoidplugin.dir/plasmoidplugin_automoc.cpp.o [100%] Linking CXX shared library libplasmoidplugin.so CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::getExchangeRatesUpdateTime()': qwrapper.cpp:(.text+0x60e): undefined reference to `Calculator::getExchangeRatesTime()' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::checkReturnState()': qwrapper.cpp:(.text+0x80c): undefined reference to `Calculator::aborted()' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::printResultInBase(int, MathStructure&, QString&)': qwrapper.cpp:(.text+0xc3a): undefined reference to `Calculator::print[abi:cxx11](MathStructure const&, int, PrintOptions const&)' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::runCalculation(std::__cxx11::basic_string, std::allocator > const&)': qwrapper.cpp:(.text+0x141c): undefined reference to `Calculator::print[abi:cxx11](MathStructure const&, int, PrintOptions const&)' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::worker()': qwrapper.cpp:(.text+0x2047): undefined reference to `Calculator::startControl(int)' qwrapper.cpp:(.text+0x205b): undefined reference to `Calculator::stopControl()' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::QWrapper(QObject*)': qwrapper.cpp:(.text+0x2557): undefined reference to `Calculator::useDecimalPoint(bool)' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::fileDownloaded(QNetworkReply*)': qwrapper.cpp:(.text+0x2c6a): undefined reference to `Calculator::getExchangeRatesTime()' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::setDecimalSeparator(QString const&)': qwrapper.cpp:(.text+0x261): undefined reference to `Calculator::useDecimalPoint(bool)' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `_GLOBAL__sub_I_qwrapper.cpp': qwrapper.cpp:(.text.startup+0x33f): undefined reference to `Number::Number(long, long, long)' collect2: error: ld returned 1 exit status plugin/CMakeFiles/plasmoidplugin.dir/build.make:147: recipe for target 'plugin/libplasmoidplugin.so' failed make[2]: *** [plugin/libplasmoidplugin.so] Error 1 CMakeFiles/Makefile2:155: recipe for target 'plugin/CMakeFiles/plasmoidplugin.dir/all' failed make[1]: *** [plugin/CMakeFiles/plasmoidplugin.dir/all] Error 2 Makefile:138: recipe for target 'all' failed make: *** [all] Error 2

finally "make install" ~/setups/pkg/qalculate-0.4.0/build$ su -c "make install" Password: [ 16%] Built target org.kde.plasma.qalculate-metadata-json [ 33%] Automatic moc for target plasmoidplugin [ 33%] Built target plasmoidplugin_automoc [ 50%] Linking CXX shared library libplasmoidplugin.so CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::updateExchangeRates()': qwrapper.cpp:(.text+0x4af): undefined reference to `Calculator::getExchangeRatesUrl[abi:cxx11](int)' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::getExchangeRatesUpdateTime()': qwrapper.cpp:(.text+0x60e): undefined reference to `Calculator::getExchangeRatesTime()' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::checkReturnState()': qwrapper.cpp:(.text+0x80c): undefined reference to `Calculator::aborted()' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::printResultInBase(int, MathStructure&, QString&)': qwrapper.cpp:(.text+0xc73): undefined reference to `Calculator::print[abi:cxx11](MathStructure const&, int, PrintOptions const&)' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::runCalculation(std::__cxx11::basic_string, std::allocator > const&)': qwrapper.cpp:(.text+0x145c): undefined reference to `Calculator::print[abi:cxx11](MathStructure const&, int, PrintOptions const&)' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::worker()': qwrapper.cpp:(.text+0x2087): undefined reference to `Calculator::startControl(int)' qwrapper.cpp:(.text+0x209b): undefined reference to `Calculator::stopControl()' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::QWrapper(QObject*)': qwrapper.cpp:(.text+0x25c8): undefined reference to `Calculator::useDecimalPoint(bool)' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::fileDownloaded(QNetworkReply*)': qwrapper.cpp:(.text+0x2b6b): undefined reference to `Calculator::getExchangeRatesFileName[abi:cxx11](int)' qwrapper.cpp:(.text+0x2ce2): undefined reference to `Calculator::getExchangeRatesTime()' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `QWrapper::setDecimalSeparator(QString const&)': qwrapper.cpp:(.text+0x261): undefined reference to `Calculator::useDecimalPoint(bool)' CMakeFiles/plasmoidplugin.dir/qwrapper.cpp.o: In function `_GLOBAL__sub_I_qwrapper.cpp': qwrapper.cpp:(.text.startup+0x37b): undefined reference to `Number::Number(long, long, long)' collect2: error: ld returned 1 exit status plugin/CMakeFiles/plasmoidplugin.dir/build.make:147: recipe for target 'plugin/libplasmoidplugin.so' failed make[2]: *** [plugin/libplasmoidplugin.so] Error 1 CMakeFiles/Makefile2:155: recipe for target 'plugin/CMakeFiles/plasmoidplugin.dir/all' failed make[1]: *** [plugin/CMakeFiles/plasmoidplugin.dir/all] Error 2 Makefile:138: recipe for target 'all' failed make: *** [all] Error 2 Not significative output differences compiling with any of 2.0.0 or 2.4.0 versions of libqalculate for 'make' and 'make install' commands. { references like (.text+0x2c6a) and percent compiling advances as sole differs. ] Seems opendesktop.org web app

limits msg size...

There was no bugs in your code. I successfully could built qalculate after some cleaning in my own library instlltion. Thank you for you suport!