diff -up cmake/PyQtMacros.cmake cmake/PyQtMacros.cmake.lib64
--- cmake/PyQtMacros.cmake	2017-09-29 17:55:02.000000000 +0200
+++ cmake/PyQtMacros.cmake.lib64	2017-09-30 18:32:30.277970717 +0200
@@ -36,7 +36,7 @@ MACRO(PYQT_WRAP_UI outfiles )
   ELSE(WIN32)
     # TODO osx
     SET(PYUIC_WRAPPER "${CMAKE_SOURCE_DIR}/scripts/pyuic-wrapper.sh")
-    SET(PYUIC_WRAPPER_PATH "${QGIS_OUTPUT_DIRECTORY}/lib")
+    SET(PYUIC_WRAPPER_PATH "${QGIS_OUTPUT_DIRECTORY}/lib${LIB_SUFFIX}")
   ENDIF(WIN32)
 
   FOREACH(it ${ARGN})