QCA is not working under Ubuntu

[Cerberus]

I have installed the following qca packages for qca under Ubuntu 15.04:

qca2-utils       
  qca-qt5-2-utils
  libqca2                    
  libqca2-plugin-cyrus-sasl  
  libqca2-plugins            
  libqca-qt5-2-dev
  libqca2-dbg                
  libqca2-plugin-gnupg       
  libqca-qt5-2               
  libqca-qt5-2-plugins
  libqca2-dev                
  libqca2-plugin-ossl        
  libqca-qt5-2-dbg

qca2-utils       
  qca-qt5-2-utils
  libqca2                    
  libqca2-plugin-cyrus-sasl  
  libqca2-plugins            
  libqca-qt5-2-dev
  libqca2-dbg                
  libqca2-plugin-gnupg       
  libqca-qt5-2               
  libqca-qt5-2-plugins
  libqca2-dev                
  libqca2-plugin-ossl        
  libqca-qt5-2-dbg

To copy to clipboard, switch view to plain text mode 

When running the command dpkg -L libqca2 I get the following:

/usr
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu/libqca.so.2.1.0
/usr/share
/usr/share/doc
/usr/share/doc/libqca2
/usr/share/doc/libqca2/copyright
/usr/share/doc/libqca2/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/libqca.so.2

/usr
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu/libqca.so.2.1.0
/usr/share
/usr/share/doc
/usr/share/doc/libqca2
/usr/share/doc/libqca2/copyright
/usr/share/doc/libqca2/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/libqca.so.2

To copy to clipboard, switch view to plain text mode 

The .pro file contains the entry:

CONFIG += c++11 crypto

CONFIG += c++11 crypto

To copy to clipboard, switch view to plain text mode 

and in the main.cpp I have:

#include <Qca-qt5/QtCrypto/QtCrypto>
 #include <QtCrypto/QtCrypto>
 
 int main(int argc, char *argv[]) {
 
         QCA::Initializer init;
 
         return 0;
  }

#include <Qca-qt5/QtCrypto/QtCrypto>
 #include <QtCrypto/QtCrypto>

 int main(int argc, char *argv[]) {

         QCA::Initializer init;

         return 0;
  }

To copy to clipboard, switch view to plain text mode 

But I get the error

/main.cpp:37: error: undefined reference to `QCA::Initializer::Initializer(QCA::MemoryMode, int)'

/main.cpp:37: error: undefined reference to `QCA::Initializer::Initializer(QCA::MemoryMode, int)'

To copy to clipboard, switch view to plain text mode 

Is there anything else I need to install or add in the .pro file?

[ChrisW67]

Assuming that QCA and your distro packager has installed a suitable PRF file or the like then the "crypto" in CONFIG should do everything necessary. You need to rerun qmake after changing the file.

[Cerberus]

I did the rerun of qmake but that didn't change anything!?