diff --git a/contrib/qt/convert-prl-libs-to-cmake.pl b/contrib/qt/convert-prl-libs-to-cmake.pl
--- a/contrib/qt/convert-prl-libs-to-cmake.pl
+++ b/contrib/qt/convert-prl-libs-to-cmake.pl
@@ -83,6 +83,9 @@
 if (_link_libs)
     set(_list_sep ";")
 else ()
+    # Avoid linking "-l_link_libs_NOTFOUND" if the component's
+    # INTERFACE_LINK_LIBRARY property is empty.
+    set(_link_libs "")
     set(_list_sep "")
 endif ()
 set_target_properties(Qt5::${_component} PROPERTIES