2.解壓後 ./configure執行

3.make

4.make install

完成

3.make過程中會提示很多錯誤，參考如下解決：

1. checking openssl version... too old

configure: error: OpenSSL version must be 0.9.6 or higher. Aborting. 

執行#./configure --prefix=/root/myipsec 的時候,出現上面的錯誤 

檢視已安裝的openssl版本

# openssl version

OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 

解決方法: 安裝openssl-devel

#yum -y install openssl-devel 

2.configure: error: Unable to find linux-2.6 kernel headers. Aborting.

解決方法：這裡需要核心標頭檔案，這裡使用2.6.34版本核心原始碼 

#cp linux-2.6.34.tar.bz2 /usr/src

#cd /usr/src

#tar xjvf linux-2.6.34.tar.bz2

#mv linux-2.6.34 linux 

3. undefined reference to `yywrap'

#make 的時候出現上面的錯誤 

解決方法: 安裝flex

#yum -y install flex bison

4.../../src/include-glibc/linux/swab.h:6:22: error: asm/swab.h: No such file or 

directory 

#make 的時候出現下面的錯誤: 

In file included from ../../src/include-glibc/linux/byteorder/little_endian.h:12,

from /usr/include/asm/byteorder.h:53,

from ../../src/include-glibc/linux/ip.h:20,

from isakmp.c:115:

../../src/include-glibc/linux/swab.h:6:22: error: asm/swab.h: No such file or

directory

make[4]: *** [isakmp.o] Error 1

make[4]: Leaving directory `/root/ipsec-tools-0.7.2/src/racoon'

make[3]: *** [all] Error 2

make[3]: Leaving directory `/root/ipsec-tools-0.7.2/src/racoon'

make[2]: *** [all-recursive] Error 1

make[2]: Leaving directory `/root/ipsec-tools-0.7.2/src'

make[1]: *** [all-recursive] Error 1

make[1]: Leaving directory `/root/ipsec-tools-0.7.2'

make: *** [all] Error 2 

解決方法: 拷貝swab.h

#mkdir /usr/src/核心原始碼目錄/include/asm

#cp /usr/src/核心原始碼目錄/arch/x86/include/asm/swab.h /usr/src/核心原始碼目錄/include/asm

#cp /usr/src/核心原始碼目錄/arch/x86/include/asm/swab.h /usr/include/asm

5.出現上面錯誤，需要修改configure檔案，將裡面的CFLAGS=“-g -O2”修改為CFLAGS="-g -O2 -fno-strict-aliasing",然後重新configure來過。