diff --git a/Makefile.in b/Makefile.in
index 9ac9a78..2d797dc 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -87,6 +87,8 @@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CONFIGURE_DEPENDS = @CONFIGURE_DEPENDS@
+CPLUSPLUS_FOUND_FALSE = @CPLUSPLUS_FOUND_FALSE@
+CPLUSPLUS_FOUND_TRUE = @CPLUSPLUS_FOUND_TRUE@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 CXX = @CXX@