diff --git a/Makefile.in b/Makefile.in
index 8545b60..1fab64d 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -231,6 +231,7 @@ BASE_TARGET_EXPORTS = \
 	CC="$(CC_FOR_TARGET)"; export CC; \
 	CFLAGS="$(CFLAGS_FOR_TARGET) $(SYSROOT_CFLAGS_FOR_TARGET) $(DEBUG_PREFIX_CFLAGS_FOR_TARGET)"; export CFLAGS; \
 	CONFIG_SHELL="$(SHELL)"; export CONFIG_SHELL; \
+	CPP="$(CC_FOR_TARGET) -E"; export CPP; \
 	CPPFLAGS="$(CPPFLAGS_FOR_TARGET)"; export CPPFLAGS; \
 	CXXFLAGS="$(CXXFLAGS_FOR_TARGET) $(SYSROOT_CFLAGS_FOR_TARGET) $(DEBUG_PREFIX_CFLAGS_FOR_TARGET)"; export CXXFLAGS; \
 	GCJ="$(GCJ_FOR_TARGET)"; export GCJ; \
