2.2檢查宿主機軟件要求

LFS版本：Linux From Scratch 9.0-systemd

宿主機：Lenove-IdeaPad-Y470  Ubuntu 18.04.3 LTS

一、檢查宿主機軟件要求，得出一下結論：

bash version-check.sh 
bash, version 4.4.20(1)-release
/bin/sh -> /bin/dash
ERROR: /bin/sh does not point to bash
Binutils: (GNU Binutils for Ubuntu) 2.30
version-check.sh: line 11: bison: command not found
yacc not found
bzip2,  Version 1.0.6, 6-Sept-2010.
Coreutils:  8.28
diff (GNU diffutils) 3.6
find (GNU findutils) 4.7.0-git
GNU Awk 4.1.4, API: 1.1 (GNU MPFR 4.0.1, GNU MP 6.1.2)
/usr/bin/awk -> /usr/bin/gawk
gcc (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0
g++ (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0
(Ubuntu GLIBC 2.27-3ubuntu1) 2.27
grep (GNU grep) 3.1
gzip 1.6
Linux version 5.0.0-36-generic (buildd@lgw01-amd64-060) (gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)) #39~18.04.1-Ubuntu SMP Tue Nov 12 11:09:50 UTC 2019
version-check.sh: line 41: m4: command not found
GNU Make 4.1
GNU patch 2.7.6
Perl version='5.26.1';
Python 3.6.8
sed (GNU sed) 4.4
tar (GNU tar) 1.29
version-check.sh: line 48: makeinfo: command not found
xz (XZ Utils) 5.2.2
g++ compilation OK

錯誤，解決：

1、shell 腳本未指向bash，而是指向dash

 sudo  ln -sf bash /bin/sh #修改默認腳本鏈接

2、bison: command not found

sudo apt-get install bison #安裝bison

3、yacc not found

安裝完bison後yacc也被安裝上

4、m4: command not found

安裝完bison後該錯誤消失

5、makeinfo: command not found

sudo apt-get install texinfo #安裝makeinfo

錯誤解決完成後輸出結果：

bash, version 4.4.20(1)-release
/bin/sh -> /bin/bash
Binutils: (GNU Binutils for Ubuntu) 2.30
bison (GNU Bison) 3.0.4
/usr/bin/yacc -> /usr/bin/bison.yacc
bzip2,  Version 1.0.6, 6-Sept-2010.
Coreutils:  8.28
diff (GNU diffutils) 3.6
find (GNU findutils) 4.7.0-git
GNU Awk 4.1.4, API: 1.1 (GNU MPFR 4.0.1, GNU MP 6.1.2)
/usr/bin/awk -> /usr/bin/gawk
gcc (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0
g++ (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0
(Ubuntu GLIBC 2.27-3ubuntu1) 2.27
grep (GNU grep) 3.1
gzip 1.6
Linux version 5.0.0-36-generic (buildd@lgw01-amd64-060) (gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)) #39~18.04.1-Ubuntu SMP Tue Nov 12 11:09:50 UTC 2019
m4 (GNU M4) 1.4.18
GNU Make 4.1
GNU patch 2.7.6
Perl version='5.26.1';
Python 3.6.8
sed (GNU sed) 4.4
tar (GNU tar) 1.29
texi2any (GNU texinfo) 6.5
xz (XZ Utils) 5.2.2
g++ compilation OK