composer安装，缺少gd库，编译安装gd报错？

错误代码如下

root@ubuntu:~/lnmp/src/php-5.6.14/ext/gd# make && make install
/bin/bash /root/lnmp/src/php-5.6.14/ext/gd/libtool --mode=compile cc -I/root/lnmp/src/php-5.6.14/ext/gd/libgd -DHAVE_LIBPNG -I. -I/root/lnmp/src/php-5.6.14/ext/gd -DPHP_ATOM_INC -I/root/lnmp/src/php-5.6.14/ext/gd/include -I/root/lnmp/src/php-5.6.14/ext/gd/main -I/root/lnmp/src/php-5.6.14/ext/gd -I/usr/local/php/include/php -I/usr/local/php/include/php/main -I/usr/local/php/include/php/TSRM -I/usr/local/php/include/php/Zend -I/usr/local/php/include/php/ext -I/usr/local/php/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /root/lnmp/src/php-5.6.14/ext/gd/gd.c -o gd.lo 
mkdir .libs
 cc -I/root/lnmp/src/php-5.6.14/ext/gd/libgd -DHAVE_LIBPNG -I. -I/root/lnmp/src/php-5.6.14/ext/gd -DPHP_ATOM_INC -I/root/lnmp/src/php-5.6.14/ext/gd/include -I/root/lnmp/src/php-5.6.14/ext/gd/main -I/root/lnmp/src/php-5.6.14/ext/gd -I/usr/local/php/include/php -I/usr/local/php/include/php/main -I/usr/local/php/include/php/TSRM -I/usr/local/php/include/php/Zend -I/usr/local/php/include/php/ext -I/usr/local/php/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /root/lnmp/src/php-5.6.14/ext/gd/gd.c  -fPIC -DPIC -o .libs/gd.o
/root/lnmp/src/php-5.6.14/ext/gd/gd.c:80:24: fatal error: ft2build.h: No such file or directory
 #  include <ft2build.h>
                        ^
compilation terminated.
make: *** [gd.lo] Error 1

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 ft2build.h  No such file or directory  是一个典型错误 你google一下就有方法的