when I install vim5.6, I got the following problems: cc -O2 -fno-strength-reduce -Wall -DUNIX -o xxd xxd.c xxd.c: In function `main': xxd.c:618: warning: subscript has type `char' xxd.c:637: warning: subscript has type `char' c -Iproto version.c sh: c: not found *** Error code 1 (ignored) /link.sh: /link.sh: cannot open *** Error code 1 make: Fatal error: Command failed for target `vim' Current working directory /vim/vim-5.6/src *** Error code 1 make: Fatal error: Command failed for ta