Index: meson/part/exports/meson.build
===================================================================
--- meson/part/exports/meson.build	(revision 4b9213ddfddbd2707165d1dad24b14d20e8320fc)
+++ meson/part/exports/meson.build	(revision 0640d528bb25d3f1dffb81300a1a9ced7b1dc076)
@@ -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',
 ]