Allow generating translations even with a separate build directory
diff --git a/po/CMakeLists.txt b/po/CMakeLists.txt
index 6dd092e..fcc0027 100644
--- a/po/CMakeLists.txt
+++ b/po/CMakeLists.txt
@@ -12,7 +12,6 @@
 if (GETTEXT_XGETTEXT_EXECUTABLE)
   # Get list of all source files
   file(GLOB_RECURSE po_source
-    RELATIVE ${PROJECT_SOURCE_DIR}
     ${PROJECT_SOURCE_DIR}/vncviewer/*.h
     ${PROJECT_SOURCE_DIR}/vncviewer/*.cxx
   )