cysignals $(SAGE_SRC)/sage/numerical/backends/generic_backend.pxd $(SAGE_SRC)/sage/cpython/string.pxd $(SAGE_SRC)/sage/cpython/string_impl.h | $(SAGERUNTIME) $(PYTHON_TOOLCHAIN) cython ipywidgets

----------
All lines of this file are ignored except the first.
It is copied by SAGE_ROOT/build/make/install into SAGE_ROOT/build/make/Makefile.
