今天心血来潮，想编译一下Linux内核来玩玩。从Git上下载了最新版本的源码，放在我的ubuntu系统下，首先从现有ubuntu系统的boot目录下，拷贝了config-3.13.0-32-generic文件到linux源码根目录下，改名为.config文件。然后make clean，make menuconfig，save，然后运行make bzImage。
结果提示如下：
leon@Ubuntu:~/linux$ make bzImage
scripts/kconfig/conf --silentoldconfig Kconfig
SYSHDR arch/x86/entry/syscalls/../../include/generated/asm/unistd_32_ia32.h
SYSHDR arch/x86/entry/syscalls/../../include/generated/asm/unistd_64_x32.h
SYSTBL arch/x86/entry/syscalls/../../include/generated/asm/syscalls_64.h
HYPERCALLS arch/x86/entry/syscalls/../../include/generated/asm/xen-hypercalls.h
CHK include/config/kernel.release
UPD include/config/kernel.release
CHK include/generated/uapi/linux/version.h
CHK include/generated/utsrelease.h
UPD include/generated/utsrelease.h
CC kernel/bounds.s
CHK include/generated/bounds.h
UPD include/generated/bounds.h
CHK include/generated/timeconst.h
UPD include/generated/timeconst.h
CC arch/x86/kernel/asm-offsets.s
CHK include/generated/asm-offsets.h
UPD include/generated/asm-offsets.h
CALL scripts/checksyscalls.sh
HOSTCC scripts/genksyms/genksyms.o
SHIPPED scripts/genksyms/parse.tab.c
HOSTCC scripts/genksyms/parse.tab.o
SHIPPED scripts/genksyms/lex.lex.c
SHIPPED scripts/genksyms/keywords.hash.c
SHIPPED scripts/genksyms/parse.tab.h
HOSTCC scripts/genksyms/lex.lex.o
HOSTLD scripts/genksyms/genksyms
CC scripts/mod/empty.o
HOSTCC scripts/mod/mk_elfconfig
MKELF scripts/mod/elfconfig.h
HOSTCC scripts/mod/modpost.o
CC scripts/mod/devicetable-offsets.s
GEN scripts/mod/devicetable-offsets.h
HOSTCC scripts/mod/file2alias.o
HOSTCC scripts/mod/sumversion.o
HOSTLD scripts/mod/modpost
HOSTCC scripts/selinux/genheaders/genheaders
HOSTCC scripts/selinux/mdp/mdp
HOSTCC scripts/kallsyms
HOSTCC scripts/conmakehash
HOSTCC scripts/recordmcount
HOSTCC scripts/sortextable
HOSTCC scripts/asn1_compiler
HOSTCC scripts/sign-file
scripts/sign-file.c:25:30: 致命错误： openssl/opensslv.h：没有那个文件或目录
编译中断。
make[1]: *** [scripts/sign-file] 错误 1
make: *** [scripts] 错误 2
很明显，系统中缺失了一个头文件。百度一下，发现是缺少一个库造成。直接运行以下命令即可：
leon@Ubuntu:~/linux$ sudo apt-get install libssl-dev
[sudo] password for leon:
正在读取软件包列表... 完成
正在分析软件包的依赖关系树
正在读取状态信息... 完成
将会安装下列额外的软件包：
libssl-doc
下列【新】软件包将被安装：
libssl-dev libssl-doc
升级了 0 个软件包，新安装了 2 个软件包，要卸载 0 个软件包，有 221 个软件包未被升级。
需要下载 2,623 kB 的软件包。
解压缩后会消耗掉 7,783 kB 的额外空间。
您希望继续执行吗？[Y/n]y
获取：1 http://cn.archive.ubuntu.com/ubuntu/ precise-updates/main libssl-dev amd64 1.0.1-4ubuntu5.38 [1,581 kB]
获取：2 http://cn.archive.ubuntu.com/ubuntu/ precise-updates/main libssl-doc all 1.0.1-4ubuntu5.38 [1,042 kB]
下载 2,623 kB，耗时 18秒 (145 kB/s)
Selecting previously unselected package libssl-dev.
(正在读取数据库 ... 系统当前共安装有 164996 个文件和目录。)
正在解压缩 libssl-dev (从 .../libssl-dev_1.0.1-4ubuntu5.38_amd64.deb) ...
Selecting previously unselected package libssl-doc.
正在解压缩 libssl-doc (从 .../libssl-doc_1.0.1-4ubuntu5.38_all.deb) ...
正在处理用于 man-db 的触发器...
正在设置 libssl-dev (1.0.1-4ubuntu5.38) ...
正在设置 libssl-doc (1.0.1-4ubuntu5.38) ...
安装完毕之后，编译命令便可以正常运行了。编译完成之后提示：
....
CC arch/x86/boot/video-mode.o
CC arch/x86/boot/version.o
CC arch/x86/boot/video-vga.o
CC arch/x86/boot/video-vesa.o
CC arch/x86/boot/video-bios.o
LD arch/x86/boot/setup.elf
OBJCOPY arch/x86/boot/setup.bin
OBJCOPY arch/x86/boot/vmlinux.bin
HOSTCC arch/x86/boot/tools/build
BUILD arch/x86/boot/bzImage
Setup is 17612 bytes (padded to 17920 bytes).
System is 6393 kB
CRC 78537565
Kernel: arch/x86/boot/bzImage is ready (#1)
搞定，收工！