I'm using Debian Lenny. I want to know how I can check if my lapack,cblas libs support long double type. If these libs don't support long double. I need to download the source and re-compile them with long-double option. If I do this, do the compiled new libs overwrite the old libs (which don't support long double)? Will this cause problem for other dependent programs that don't need long double? Thank you very much!