"hi" <serverback at 126.com> writes: Hi, i have downloaded the whole gmplib 4.2.1 from the link at swox.com. Then, i unpack the file. I searched the whole packege, and didnot find the gmp.h file. where to find it? Without it, I cannot use the lib!!! Without compiling the library, I suspect you also cannot use it. Hint: compile and look for gmp.h again. -- Torbjörn