https://github.com/kvirc/KVIrc/pull/2269

--- /CMakeLists.txt
+++ /CMakeLists.txt
@@ -67,9 +67,6 @@
 set(CMAKE_KVIRC_BUILD_COMPILER ${CMAKE_CXX_COMPILER})
 set(CMAKE_KVIRC_BUILD_COMPILER_FLAGS ${CMAKE_CXX_FLAGS})
 
-# Prefer Python 2.7 over 3.x (which is currently incompatible) - GitHub issue #2020
-set(Python_ADDITIONAL_VERSIONS "2.7")
-
 # Suffix for GNU/Linux
 set(LIB_SUFFIX
 	CACHE STRING "Define suffix of directory name (32/64)"
@@ -751,10 +748,10 @@
 # Check for Python support
 option(WANT_PYTHON "Compile Python support" ON)
 if(WANT_PYTHON)
-	find_package(PythonLibs 2.7)
+	find_package(PythonLibs)
 	if(PYTHONLIBS_FOUND)
 		set(COMPILE_PYTHON_SUPPORT 1)
-		set(CMAKE_STATUS_PYTHON_SUPPORT "Yes")
+		set(CMAKE_STATUS_PYTHON_SUPPORT "Yes, Python ${PYTHONLIBS_VERSION_STRING}")
 		list(APPEND LIBS ${PYTHON_LIBRARIES})
 		include_directories(${PYTHON_INCLUDE_DIRS})
 	else()
--- /src/modules/pythoncore/kvircmodule.cpp
+++ /src/modules/pythoncore/kvircmodule.cpp
@@ -413,7 +413,7 @@
 	else
 	{
 		// Create a CObject containing the API pointer array's address
-		PyObject * pC_API_Object = PyCObject_FromVoidPtr(PyKVIrc_API, nullptr);
+		PyObject * pC_API_Object = PyCapsule_New((void *)PyKVIrc_API, "kvirc._C_API", nullptr);
 		if(pC_API_Object)
 			PyModule_AddObject(pModule, "_C_API", pC_API_Object);
 	}
--- /src/modules/pythoncore/pythonheaderwrapper.h
+++ /src/modules/pythoncore/pythonheaderwrapper.h
@@ -1,6 +1,12 @@
 #ifndef _PYTHONHEADERWRAPPER_H_
 #define _PYTHONHEADERWRAPPER_H_
 
+// As of Python 3, something inside <Python.h> defines a struct with a member
+// called "slots" which conflicts with the builtin Qt keyword. But since we
+// include stuff from KVIrc itself back into the python module, we can't just
+// use QT_NO_KEYWORDS.
+#undef slots
+
 // See http://stackoverflow.com/questions/16200997/why-doesnt-include-python-h-work and http://stackoverflow.com/questions/19716859/puzzling-dependency-of-boost-python-1-54-debug-build-to-python27-lib-on-window
 
 #if defined(_DEBUG) && defined(_MSC_VER)