Index: meson/part/exports/meson.build
===================================================================
--- meson/part/exports/meson.build	(revision 4b9213ddfddbd2707165d1dad24b14d20e8320fc)
+++ meson/part/exports/meson.build	(revision ec3ef80f7eaef65d4d3d43cc263dcef309a2e59b)
@@ -39,4 +39,5 @@
 	'-isystem', '$(HELENOS_EXPORT_ROOT)/include/libposix',
 	'-isystem', '$(HELENOS_EXPORT_ROOT)/include/libc',
+	'-isystem', '$(HELENOS_EXPORT_ROOT)/include/libcpp',
 	'-idirafter', '$(HELENOS_EXPORT_ROOT)/include',
 ]