LAB 4 IS DONE.

lab/conf/env.mk

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+# env.mk - configuration variables for the JOS lab
+
+# '$(V)' controls whether the lab makefiles print verbose commands (the
+# actual shell commands run by Make), as well as the "overview" commands
+# (such as '+ cc lib/readline.c').
+#
+# For overview commands only, the line should read 'V = @'.
+# For overview and verbose commands, the line should read 'V ='.
+V = @
+
+# If your system-standard GNU toolchain is ELF-compatible, then comment
+# out the following line to use those tools (as opposed to the i386-jos-elf
+# tools that the 6.828 make system looks for by default).
+#
+# GCCPREFIX=''
+
+# If the makefile cannot find your QEMU binary, uncomment the
+# following line and set it to the full path to QEMU.
+#
+# QEMU=