unset SDKROOT ; \
unset UNIVERSAL_SDK_PATH ; \
configure_opts= ; \
- if test "$ENABLE_LIBCPP" -ne 0 ; then \
+ if test "$(ENABLE_LIBCPP)" -ne 0 ; then \
configure_opts="$$configure_opts --enable-libcpp"; \
fi; \
$(PROJ_SRC_DIR)/configure --build=$(BUILD_TRIPLE) \