diff -up plplot-5.12.0/cmake/modules/qt.cmake.fix plplot-5.12.0/cmake/modules/qt.cmake
--- plplot-5.12.0/cmake/modules/qt.cmake.fix	2017-06-22 15:48:26.304201033 -0400
+++ plplot-5.12.0/cmake/modules/qt.cmake	2017-06-22 15:48:36.207954905 -0400
@@ -442,9 +442,9 @@ if(ENABLE_pyqt5)
   # FIXME: What about OS-X?
   if (WIN32 AND NOT CYGWIN)
     # FIXME: This is almost surely wrong.
-    set(PYQT_SIP_DIR "${PYQT_SIP_DIR}/sip/PyQt5/")
+    set(PYQT_SIP_DIR "${PYQT_SIP_DIR}/sip/PyQt5")
   else (WIN32 AND NOT CYGWIN)
-    set(PYQT_SIP_DIR "${PYQT_SIP_DIR}/share/sip/PyQt5/")
+    set(PYQT_SIP_DIR "${PYQT_SIP_DIR}/share/sip/PyQt5")
   endif (WIN32 AND NOT CYGWIN)
 
   message(STATUS "pyqt5: PYQT_SIP_DIR = ${PYQT_SIP_DIR}")