diff --git a/ChangeLog b/ChangeLog
index 801ae7dc5d65c..3cd3137c7f0cf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2019-08-23  Michael Forney  <mforney@mforney.org>
+
+	* Makefile.tpl (HOST_EXPORTS): Add CXX_FOR_BUILD.
+	* Makefile.in: Regenerate.
+
 2019-08-19  Tom Tromey  <tom@tromey.com>
 
 	* configure: Rebuild.
diff --git a/Makefile.in b/Makefile.in
index 02cc7a3909487..86c0c6d5b2d2c 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -198,6 +198,7 @@ HOST_EXPORTS = \
 	AR="$(AR)"; export AR; \
 	AS="$(AS)"; export AS; \
 	CC_FOR_BUILD="$(CC_FOR_BUILD)"; export CC_FOR_BUILD; \
+	CXX_FOR_BUILD="$(CXX_FOR_BUILD)"; export CXX_FOR_BUILD; \
 	DLLTOOL="$(DLLTOOL)"; export DLLTOOL; \
 	LD="$(LD)"; export LD; \
 	LDFLAGS="$(STAGE1_LDFLAGS) $(LDFLAGS)"; export LDFLAGS; \
diff --git a/Makefile.tpl b/Makefile.tpl
index 1cdc023c82f9c..efed151175041 100644
--- a/Makefile.tpl
+++ b/Makefile.tpl
@@ -201,6 +201,7 @@ HOST_EXPORTS = \
 	AR="$(AR)"; export AR; \
 	AS="$(AS)"; export AS; \
 	CC_FOR_BUILD="$(CC_FOR_BUILD)"; export CC_FOR_BUILD; \
+	CXX_FOR_BUILD="$(CXX_FOR_BUILD)"; export CXX_FOR_BUILD; \
 	DLLTOOL="$(DLLTOOL)"; export DLLTOOL; \
 	LD="$(LD)"; export LD; \
 	LDFLAGS="$(STAGE1_LDFLAGS) $(LDFLAGS)"; export LDFLAGS; \