In linux, ./get-gdb.py, report errors:
sh: axel: command not found
Download GDB source package failed. [Retry]/Exit:Retry
sh: axel: command not found
Download GDB source package failed. [Retry]/Exit:Retry

Details below:
[AliceGuo@local170 get-gdb-master]$ ./get-gdb.py
[0] English
[1] Chinese
Which language do you want to use?0
Current system is "Redhat".
[0] 6.1.1
[1] 6.2.1
[2] 6.3
[3] 6.4
[4] 6.5
[5] 6.6
[6] 6.7
[7] 6.7.1
[8] 6.8
[9] 7.0.1
[10] 7.1
[11] 7.2
[12] 7.3.1
[13] 7.4.1
[14] 7.5.1
[15] 7.6.2
[16] 7.7.1
[17] 7.8
Which version of GDB do you want to install?[17]14
[0] Current architecture
[1] Input other
[2] x86_64-linux
[3] arm-linux
[4] mips-linux
Which architecture do you want to build?[0]2
Build and install GDB ...
Do you want to install GDB after it is built? Yes/No:Yes
Please input the PREFIX directory that you want to install(GDB will be installed to PREFIX/bin/):[/usr/local/]
Please input the directory that you want to build GDB:[/home/AliceGuo/scripts/get-gdb-master]
Please input the number of jobs to compile GDB:[2]
gcc-4.1.2-54.el5
package texinfo is not installed
m4-1.4.5-3.el5.1
package flex is not installed
package bison is not installed
ncurses-devel-5.5-24.20060715
ncurses-devel-5.5-24.20060715
package expat-devel is not installed
python-devel-2.4.3-56.el5
package axel is not installed
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile

• addons: ftp.cuhk.edu.hk
• base: ftp.cuhk.edu.hk
• extras: ftp.cuhk.edu.hk
• updates: ftp.cuhk.edu.hk
  Setting up Install Process
  No package axel available.
  Resolving Dependencies
  There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them.
  The program yum-complete-transaction is found in the yum-utils package.
  --> Running transaction check
  ---> Package bison.x86_64 0:2.3-2.1 set to be updated
  ---> Package expat-devel.i386 0:1.95.8-11.el5_8 set to be updated
  ---> Package expat-devel.x86_64 0:1.95.8-11.el5_8 set to be updated
  ---> Package flex.x86_64 0:2.5.4a-41.fc6 set to be updated
  ---> Package texinfo.x86_64 0:4.8-14.el5 set to be updated
  --> Finished Dependency Resolution

Dependencies Resolved

Package Arch Version Repository Size

Installing:
bison x86_64 2.3-2.1 base 549 k
expat-devel i386 1.95.8-11.el5_8 base 132 k
expat-devel x86_64 1.95.8-11.el5_8 base 129 k
flex x86_64 2.5.4a-41.fc6 base 131 k
texinfo x86_64 4.8-14.el5 base 763 k

Transaction Summary

Install 5 Package(s)
Update 0 Package(s)
Remove 0 Package(s)

Total download size: 1.7 M
Downloading Packages:
(1/5): expat-devel-1.95.8-11.el5_8.x86_64.rpm | 129 kB 00:01
(2/5): flex-2.5.4a-41.fc6.x86_64.rpm | 131 kB 00:00
(3/5): expat-devel-1.95.8-11.el5_8.i386.rpm | 132 kB 00:00
(4/5): bison-2.3-2.1.x86_64.rpm | 549 kB 00:00

(5/5): texinfo-4.8-14.el5.x86_64.rpm | 763 kB 00:00

Total 298 kB/s | 1.7 MB 00:05
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : texinfo 1/5
Installing : expat-devel 2/5
Installing : bison 3/5
Installing : expat-devel 4/5
Installing : flex 5/5

Installed:
bison.x86_64 0:2.3-2.1 expat-devel.i386 0:1.95.8-11.el5_8 expat-devel.x86_64 0:1.95.8-11.el5_8 flex.x86_64 0:2.5.4a-41.fc6
texinfo.x86_64 0:4.8-14.el5

Complete!
sh: axel: command not found
Download GDB source package failed. [Retry]/Exit:Retry
sh: axel: command not found
Download GDB source package failed. [Retry]/Exit:Retry
sh: axel: command not found
Download GDB source package failed. [Retry]/Exit: