Gnugpg 安装

最近由于项目的需求，要对所有发送到客户FTP的文档进行不对称加密，所以需要用到gnugpg这款开源的加密解密软件，因此需要在Linux下进行安装，由于Linux是Redhat4，没有Yum这类在线安装软件，需要源代码编译安装，安装过程有点复杂而且遇到一些问题，特此记录下来，以备后查：

1、解压下载的文件包：

    tar -xjf gnupg-2.0.21.tar.bz2

2、./configure

得到以下信息：
configure: (libgpg-error-1.9)
***
*** You need libgpg-error to build this program.
**  This library is for example available at
***   ftp://ftp.gnupg.org/gcrypt/libgpg-error
*** (at least version 1.11 is required.)
***
configure: (libgcrypt-1.5.3)
***
*** You need libgcrypt to build this program.
**  This library is for example available at
***   ftp://ftp.gnupg.org/gcrypt/libgcrypt/
*** (at least version 1.4.0 using API 1 is required.)
***
configure: (libassuan-2.1.0)
***
*** You need libassuan to build this program.
*** This library is for example available at
***   ftp://ftp.gnupg.org/gcrypt/libassuan/
*** (at least version 2.0.0 (API 2) is required).
***
configure: (libksba-1.3.0)
***
*** You need libksba to build this program.
*** This library is for example available at
***   ftp://ftp.gnupg.org/gcrypt/libksba/
*** (at least version 1.0.7 using API 1 is required).
***
configure: (pth-2.0.7)
***
*** It is now required to build with support for the
*** GNU Portable Threads Library (Pth). Please install this
*** library first.  The library is for example available at
***   ftp://ftp.gnu.org/gnu/pth/
*** On a Debian GNU/Linux system you can install it using
***   apt-get install libpth-dev
*** To build GnuPG for Windows you need to use the W32PTH
*** package; available at:
***   ftp://ftp.g10code.com/g10code/w32pth/
***
configure: error:
***
*** Required libraries not found. Please consult the above messages
*** and install them before running configure again.
***

逐个在上面指定的FTP上下载所依赖的包，上传到Linux服务器，一个个解压后均运行：./configure、make、 make install 命令进行编译安装。

3. 以上的包安装完成后再次运行GnuGpg的安装脚本。

./cofigure、make、 make install

但运行到make 的时候遇到以下错误提示：

“gpg2: error while loading shared libraries: libassuan.so.0: cannot open shared object file: No such file or directory”

解决方法：

 在/etc/ld.so.config.d文件夹下创建 gpg2.conf 文件，在此文件内加入一行：/usr/local/lib. 保存

使用ldconfig -v 即可以查询到 /usr/local/lib.