刚开始用pecl install v8js 安装，又用如下编译安装，都是出现同样的如下提示。

root@ubuntu:/usr/local/src/v8js-1.3.5# ./configure --with-PHP-config=/usr/local/PHP7/bin/PHP-config 
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for a sed that does not truncate output... /bin/sed
checking for cc... cc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether cc accepts -g... yes
checking for cc option to accept ISO C89... none needed
checking how to run the C preprocessor... cc -E
checking for icc... no
checking for suncc... no
checking whether cc understands -c and -o together... yes
checking for system library directory... lib
checking if compiler supports -R... no
checking if compiler supports -Wl,-rpath,... yes
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking target system type... x86_64-unknown-linux-gnu
checking for PHP prefix... /usr/local/PHP7
checking for PHP includes... -I/usr/local/PHP7/include/PHP -I/usr/local/PHP7/include/PHP/main -I/usr/local/PHP7/include/PHP/TSRM -I/usr/local/PHP7/include/PHP/Zend -I/usr/local/PHP7/include/PHP/ext -I/usr/local/PHP7/include/PHP/ext/date/lib
checking for PHP extension directory... /usr/local/PHP7/lib/PHP/extensions/no-debug-non-zts-20160303
checking for PHP installed headers prefix... /usr/local/PHP7/include/PHP
checking if debug is enabled... no
checking if zts is enabled... no
checking for re2c... re2c
checking for re2c version... 0.13.5 (ok)
checking for gawk... gawk
checking for V8 Javascript Engine... yes,shared
checking for V8 files in default path... not found
configure: error: Please reinstall the v8 distribution

然后试着安装apt-get install libv8-dev 后，继续，如下

root@ubuntu:/usr/local/src/v8js-1.3.5# ./configure --with-PHP-config=/usr/local/PHP7/bin/PHP-config 
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for a sed that does not truncate output... /bin/sed
checking for cc... cc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether cc accepts -g... yes
checking for cc option to accept ISO C89... none needed
checking how to run the C preprocessor... cc -E
checking for icc... no
checking for suncc... no
checking whether cc understands -c and -o together... yes
checking for system library directory... lib
checking if compiler supports -R... no
checking if compiler supports -Wl,shared
checking for V8 files in default path... found in /usr
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking how to run the C++ preprocessor... g++ -E
checking for C standard version... c++11
checking how to allow c++11 narrowing... 
checking for libv8_libplatform... checking for libv8_libplatform... configure: error: could not find libv8_libplatform library

die

看文档，可能是libv8库版本过低，

V8 Javascript Engine library (libv8) master https://github.com/v8/v8-git-mirror (trunk)

V8 is Google's open source Javascript engine. V8 is written in C++ and is used in Google Chrome,the open source browser from Google. V8 implements ECMAScript as specified in ECMA-262,5th edition.

This extension requires V8 4.6.76 or higher.

V8 releases are published rather quickly and the V8 team usually provides security support for the version line shipped with the Chrome browser (stable channel) and newer (only). For a version overview see https://omahaproxy.appspot.com/.

PHP 7.0.0+

This embedded implementation of the V8 engine uses thread locking so it works with ZTS enabled.

安装libv8最新版（5以上）（库地址：https://launchpad.net/~pinepain）

sudo add-apt-repository ppa:pinepain/libv8-5.2
sudo apt-get update

卸载原先的libv8-dev,执行apt-get install libv8-5.2-dev

nice

Build process completed successfully
Installing '/usr/lib/PHP5/20121212/v8js.so'
install ok: channel://pecl.PHP.net/v8js-0.6.4
configuration option "PHP_ini" is not set to PHP.ini location
You should add "extension=v8js.so" to PHP.ini

PHP7也安装成功

root@ubuntu:/etc/PHP5/fpm/conf.d# /usr/local/PHP7/bin/pecl install v8js

Build process completed successfully
Installing '/usr/local/PHP7/lib/PHP/extensions/no-debug-non-zts-20160303/v8js.so'
install ok: channel://pecl.PHP.net/v8js-1.3.5
configuration option "PHP_ini" is not set to PHP.ini location
You should add "extension=v8js.so" to PHP.ini