On 10 January 2017 at 09:00, Jonathan Wakely wrote: > On 10 January 2017 at 02:39, ssmtpmailtesting ssmtpmailtesting wrote: > > The current linux os I'm using is in /dev/sda7, mounted as /(root). > > I've mounted /dev/sda2 in /media/sda2. Now trying to install gcc in > > /media/sda2/usr/bin. > > Then build GCC with --prefix=/media/sda2/usr I don't think that's enough. This would generate GCC executables polluted by things in current system. For example, /media/sda2/usr/libexec/gcc/{version}/cc1 may link to (in sda7) /usr/lib/libgmp.so But actually there may be no /media/sda2/usr/lib/libgmp.so. So when you try to invoke GCC in /dev/sda2, you'll receive error while loading shared libraries: libgmp.so: cannot open shared object file: No such file or directory That's bad. I suggest to chroot into /media/sda2. -- Xi Ruoyao <ryxi@xxxxxxxxxxxxxxxxx> School of Aerospace Science and Technology, Xidian University