Update README.md

README.md

@@ -18,7 +18,8 @@ Tested working (as sane as I could test for) on:
     * when you try to build on el5, must enable the EPEL repository.
     * when you try to build on el6, can use `devtoolset-3` and `SCL` repository.
         - RHEL6.x: [Red Hat Developer Toolset](https://access.redhat.com/documentation/en-US/Red_Hat_Developer_Toolset/) , [Red Hat Software Collections](https://access.redhat.com/documentation/en-US/Red_Hat_Software_Collections/index.html)
-        - CentOS6.x: [Devtoolset-3 — Software Collections](https://www.softwarecollections.org/en/scls/rhscl/devtoolset-3/) , SCL: run `yum install -y centos-release-SCL`
+        - CentOS6.x: [Devtoolset-3](https://www.softwarecollections.org/en/scls/rhscl/devtoolset-3/) , SCL: run `yum install -y centos-release-SCL`
+        - `yum install -y devtoolset-3-gcc-c++ python27`
 
 setting up:
 
@@ -32,11 +33,22 @@ git clone and make:
 $ git clone https://github.com/kazuhisya/nodejs-rpm.git
 $ cd nodejs-rpm
 $ sudo yum-builddep ./nodejs.spec
+```
+
+el7:
+
+```bash
 $ make rpm
 ```
 
+el6 :Software Collections and Devtoolset
+
 install package:
 
+```bash
+$ scl enable python27 devtoolset-3 'make rpm'
+```
+
 ```bash
 $ cd ./dist/RPMS/x86_64/
 $ sudo yum install ./nodejs-X.X.X-X.el6.x86_64.rpm ./nodejs-npm-X.X.X-X.el6.x86_64.rpm --nogpgcheck