configure: error: Building GCC requires GMP 4.2+, MPFR 2.4.0+ and MPC 0.8.0+.

一、錯誤發生情景：

　　在安裝gcc時，執行.configure命令，報以下錯誤：

...省略
configure: error: Building GCC requires GMP 4.2+, MPFR 2.4.0+ and MPC 0.8.0+.
Try the --with-gmp, --with-mpfr and/or --with-mpc options to specify
their locations. Source code for these libraries can be found at
their respective hosting sites as well as at
ftp://gcc.gnu.org/pub/gcc/infrastructure/. See also
http://gcc.gnu.org/install/prerequisites.html for additional info. If
you obtained GMP, MPFR and/or MPC from a vendor distribution package,
make sure that you have installed both the libraries and the header
files. They may be located in separate packages.

二、錯誤原因：

　　錯誤信息中說明，安裝gcc需要這三個依賴：GMP 4.2+, MPFR 2.4.0+ and MPC 0.8.0+。

三、解決問題：

　　錯誤信息，提示了下載頁面的地址：ftp://gcc.gnu.org/pub/gcc/infrastructure/。

　　所以去下載相應的包，進行安裝。

　　1、打開鏈接：ftp://gcc.gnu.org/pub/gcc/infrastructure/。

　　2、找到需要的三個包地址，下載下來：

　　　　　　wget ftp://gcc.gnu.org/pub/gcc/infrastructure/gmp-6.1.0.tar.bz2

　　　　　　wget ftp://gcc.gnu.org/pub/gcc/infrastructure/mpfr-3.1.4.tar.bz2

　　　　　　wget ftp://gcc.gnu.org/pub/gcc/infrastructure/mpc-1.0.3.tar.gz

　　3、安裝GMP：　　　　　　

tar -jxvf gmp-6.1.0.tar.bz2
cd gmp-6.1.0
./configure
make && make install

　　4、安裝MPFR：

tar -jxvf mpfr-3.1.4.tar.bz2
cd mpfr-3.1.4
./configure
make && make install

　　5、安裝MPC：　

tar -zxvf mpc-1.0.3.tar.gz
cd mpc-1.0.3
./configure
make && make install

configure: error: Building GCC requires GMP 4.2+, MPFR 2.4.0+ and MPC 0.8.0+.