PHP7中的PECL yaml

pecl install yaml && echo "extension=yaml.so" > /usr/local/etc/php/conf.d/ext-yaml.ini.

但是猜想这不会安装RC版本.如何安装RC？是否有供应的参数..？

我可以谷歌下面的解决方案(未测试)：

pear config-set preferred_state beta

但我想这将为所有扩展设置一个全球beta状态.我只想安装此扩展程序作为测试版..

错误日志

running: make
/bin/bash /tmp/pear/temp/pear-build-defaultuserPVGidl/yaml-1.2.0/libtool --mode=compile cc  -I. -I/tmp/pear/temp/yaml -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-defaultuserPVGidl/yaml-1.2.0/include -I/tmp/pear/temp/pear-build-defaultuserPVGidl/yaml-1.2.0/main -I/tmp/pear/temp/yaml -I/usr/local/include/php -I/usr/local/include/php/main -I/usr/local/include/php/TSRM -I/usr/local/include/php/Zend -I/usr/local/include/php/ext -I/usr/local/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -c /tmp/pear/temp/yaml/yaml.c -o yaml.lo
mkdir .libs
 cc -I. -I/tmp/pear/temp/yaml -DPHP_ATOM_INC -I/tmp/pear/temp/pear-build-defaultuserPVGidl/yaml-1.2.0/include -I/tmp/pear/temp/pear-build-defaultuserPVGidl/yaml-1.2.0/main -I/tmp/pear/temp/yaml -I/usr/local/include/php -I/usr/local/include/php/main -I/usr/local/include/php/TSRM -I/usr/local/include/php/Zend -I/usr/local/include/php/ext -I/usr/local/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/temp/yaml/yaml.c  -fPIC -DPIC -o .libs/yaml.o
In file included from /tmp/pear/temp/yaml/yaml.c:35:0:
/tmp/pear/temp/yaml/php_yaml.h:56:40: fatal error: ext/standard/php_smart_str.h: No such file or directory
 #include <ext/standard/php_smart_str.h>
                                        ^
compilation terminated.
Makefile:195: recipe for target 'yaml.lo' failed
make: *** [yaml.lo] Error 1
ERROR: `make' failed