Question: Below is the error message when I run "scons" to compiler in windows7:

```
-----------------------------------------------------------------------------------
'cl' is not recognized as an internal or external command,
operable program or batch file.
scons: *** [out\windows-x86-MD-unicode-vs2008-rel\obj-static\src\featuresets\ada                                      pters\im-history\AddToChatRoomHistoryVisitor.obj] Error 1
scons: building terminated because of errors.
-----------------------------------------------------------------------------------

```

I have added path to environment variables already, but still met this problem.

Below is the PATH info of environment variables:

```
--------------------------------------------------------------------------------------------
PATH=C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v
1.0\;C:\Program Files\CREDANT\Shield v7.1\;C:\Program Files (x86)\QuickTime\QTSystem\;C:\Program Fil
es\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files\TortoiseSVN\bin;C:\Python27;C:\cygwin64\bin
;C:\Python27\scons-2.3.1;c:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;c:\Program File
s\Microsoft SQL Server\100\Tools\Binn\;c:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Progra
m Files (x86)\Microsoft Visual Studio 10.0\VC\bin;C:\Python27\Scripts;C:\Program Files (x86)\Microso
ft Visual Studio 10.0\VC\lib;C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include
--------------------------------------------------------------------------------------------

```

Answer: 
The location of the cl.exe executable is not in the system **PATH** environment variable.

In other words the cmd.exe command line processor has been asked to run the cl.exe executable but it can't find it. It is either not in the **PATH** or not installed.

> 
> I have added path to environment variables already, but still met this problem.
> 
> 
> 

To test this open a command prompt and type in:

*cl.exe -?*
Simply do window search for cl.exe, and add that path to PATH variable, save it. Close the existing open command and reopen it it before executing cl.exe. Hope this will work.