diff --git a/kde/applications/cantor/cantor-19.12.1-Windows.diff b/kde/applications/cantor/cantor-19.12.1-Windows.diff
index 2d6a2e88..94f1297a 100644
--- a/kde/applications/cantor/cantor-19.12.1-Windows.diff
+++ b/kde/applications/cantor/cantor-19.12.1-Windows.diff
@@ -1,27 +1,40 @@
+diff -ruNa cantor-19.12.1.orig/src/backends/R/rserver/rcallbacks.cpp cantor-19.12.1/src/backends/R/rserver/rcallbacks.cpp
+--- cantor-19.12.1.orig/src/backends/R/rserver/rcallbacks.cpp	2020-01-06 14:49:54.000000000 +0100
++++ cantor-19.12.1/src/backends/R/rserver/rcallbacks.cpp	2020-02-02 11:31:24.881735681 +0100
+@@ -26,7 +26,9 @@
+ #include <QStringList>
+ 
+ #include <stdio.h>
++#ifndef Q_OS_WIN
+ #include <Rinterface.h>
++#endif
+ 
+ RServer* server;
+ Expression* currentExpression;
 diff -ruNa cantor-19.12.1.orig/src/backends/R/rserver/rserver.cpp cantor-19.12.1/src/backends/R/rserver/rserver.cpp
 --- cantor-19.12.1.orig/src/backends/R/rserver/rserver.cpp	2020-01-06 14:49:54.000000000 +0100
 +++ cantor-19.12.1/src/backends/R/rserver/rserver.cpp	2020-02-02 10:40:27.197011563 +0100
 @@ -33,7 +33,11 @@
  #include <QDebug>
  #include <KLocalizedString>
  
 +#ifdef Q_OS_WIN
 +#include <process.h>
 +#else
  #include <unistd.h>
 +#endif
  
  //R includes
  #include <R.h>
 diff -ruNa cantor-19.12.1.orig/src/backends/R/rsession.cpp cantor-19.12.1/src/backends/R/rsession.cpp
 --- cantor-19.12.1.orig/src/backends/R/rsession.cpp	2020-01-06 14:49:54.000000000 +0100
 +++ cantor-19.12.1/src/backends/R/rsession.cpp	2020-02-02 10:39:21.189441040 +0100
 @@ -62,7 +62,7 @@
      m_process->waitForReadyRead();
      qDebug()<<m_process->readAllStandardOutput();
  
 -    m_rServer = new org::kde::Cantor::R(QString::fromLatin1("org.kde.Cantor.R-%1").arg(m_process->pid()),  QLatin1String("/"), QDBusConnection::sessionBus(), this);
 +    m_rServer = new org::kde::Cantor::R(QString::fromLatin1("org.kde.Cantor.R-%1").arg(m_process->processId()),  QLatin1String("/"), QDBusConnection::sessionBus(), this);
  
      connect(m_rServer, &org::kde::Cantor::R::statusChanged, this, &RSession::serverChangedStatus);
      connect(m_rServer,  &org::kde::Cantor::R::expressionFinished, this, &RSession::expressionFinished);