libpng 1.2.5 runtime error

Hi,

I upgraded to libpng v1.2.5 from v1.0.14. ( on a linux box, using Agg
backend and matplotlib v0.54.2 ) Now I get this Runtime error thrown
at _backend_agg.cpp line 948

png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL,
NULL);
  if (png_ptr == NULL) {
    fclose(fp);
    throw Py::RuntimeError("could not create write struct");
  }

Has anyone seen this?

thanks,
Stefan

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