Don't require Python 3 for Qt5.

Use separate ENABLE_PYTHON3 option for Python 3.

CMakeLists.txt

@@ -678,11 +678,12 @@ ENDIF (UNIX AND NOT APPLE)
 #############################################################
 # Python build dependency
 
-IF(ENABLE_QT5)
+SET (ENABLE_PYTHON3 ${ENABLE_QT5} CACHE BOOL "If enabled will try to find Python 3 before looking for Python 2")
+IF(ENABLE_PYTHON3)
   SET(PYTHON_VER 3 CACHE STRING "Python version")
-ELSE(ENABLE_QT5)
+ELSE(ENABLE_PYTHON3)
   SET(PYTHON_VER 2.7 CACHE STRING "Python version")
-ENDIF(ENABLE_QT5)
+ENDIF(ENABLE_PYTHON3)
 
 FIND_PACKAGE(PythonInterp ${PYTHON_VER} REQUIRED)
 
@@ -720,7 +721,11 @@ IF (WITH_BINDINGS)
   ENDIF (NOT BINDINGS_GLOBAL_INSTALL)
 
   IF (WITH_CUSTOM_WIDGETS)
-    SET(PYUIC_WIDGET_PLUGIN_DIRECTORY ${PYQT4_MOD_DIR}/uic/widget-plugins/)
+    IF(ENABLE_QT5)
+      SET(PYUIC_WIDGET_PLUGIN_DIRECTORY ${PYQT5_MOD_DIR}/uic/widget-plugins/)
+    ELSE(ENABLE_QT5)
+      SET(PYUIC_WIDGET_PLUGIN_DIRECTORY ${PYQT4_MOD_DIR}/uic/widget-plugins/)
+    ENDIF(ENABLE_QT5)
   ENDIF (WITH_CUSTOM_WIDGETS)
 
 ENDIF (WITH_BINDINGS)

ci/travis/linux/qt5/install.sh

@@ -36,6 +36,7 @@ cmake \
       -DWITH_ASTYLE=ON \
       -DWITH_SERVER=ON \
       -DENABLE_QT5=ON \
+      -DENABLE_PYTHON3=ON \
       -DCXX_EXTRA_FLAGS="$CLANG_WARNINGS" \
       -DPYTHON_LIBRARY=/usr/lib/libpython3.2mu.so \
       ..

cmake/FindPyQt5.py

@@ -47,7 +47,7 @@ except ImportError:
         'pyqt_version': PyQt5.QtCore.PYQT_VERSION,
         'pyqt_version_str': PyQt5.QtCore.PYQT_VERSION_STR,
         'pyqt_sip_flags': PyQt5.QtCore.PYQT_CONFIGURATION['sip_flags'],
-        'pyqt_mod_dir': cfg.default_mod_dir,
+        'pyqt_mod_dir': os.path.join(cfg.default_mod_dir, "PyQt5"),
         'pyqt_sip_dir': sip_dir,
         'pyqt_bin_dir': cfg.default_bin_dir,
     }

cmake/FindPythonLibrary.cmake

@@ -44,11 +44,11 @@ else(EXISTS "${PYTHON_INCLUDE_PATH}" AND EXISTS "${PYTHON_LIBRARY}" AND EXISTS "
     endif("${PYTHON_CUSTOM_FRAMEWORK}" MATCHES "Python\\.framework")
   endif(APPLE AND PYTHON_CUSTOM_FRAMEWORK)
 
-  IF (ENABLE_QT5)
+  IF (ENABLE_PYTHON3)
     FIND_PACKAGE(PythonInterp 3)
-  ELSE (ENABLE_QT5)
+  ELSE (ENABLE_PYTHON3)
     FIND_PACKAGE(PythonInterp 2.7)
-  ENDIF (ENABLE_QT5)
+  ENDIF (ENABLE_PYTHON3)
 
   if(PYTHONINTERP_FOUND)
     FIND_FILE(_find_lib_python_py FindLibPython.py PATHS ${CMAKE_MODULE_PATH})