On Tue, 1 Nov 2011, Hebert Suárez Cahuana wrote: Parece que algo anda mal con la versión 1.9.6, utilizo linux ubuntu, le > doy > ./configure make make check y se instala pero ahora no puede abrir ningún > archivo, no se puede hacer nada porque el programa se cierra > automáticamente y aparece en la consola el mensaje siguiente: Ilegal > instruccion > Google translation: "It seems that something is wrong with version 1.9.6, I use ubuntu linux, I give ./configure make make check and installed but now can not open any file, you can not do anything because the program closes automatically appears on the console the following message: Illegal instruction." The operating system error "Illegal instruction" means that you are trying to execute code on a given processor that was compiled for a different processor. This can happen if your gcc version is not in sync with your actual computer. What kind of CPU do you have? Is it an old machine that does not support the SSE2 instruction set? In that case when you build gretl you should configure with ./configure --disable-sse2 Allin Cottrell