check if CC compiler works

ChangeLog

@@ -34,6 +34,8 @@ Version NEXT
 	  from .fspsites files.
 	fpwd command from setup.sh now prints site name instead of ip
 	  address if possible.
+	SCons now check if CC compiler works. We need SCons 1.1 or greater
+	  for building FSP now.  
 
 Version 2.8.1b25 - 10 Sep 2009
 	GNU autotools build system was entirely replaced by SCons

SConstruct

@@ -2,7 +2,7 @@
 
 import os
 # init Scons
-EnsureSConsVersion(1,0)
+EnsureSConsVersion(1,1)
 EnsurePythonVersion(2,2)
 
 # set defaults
@@ -80,6 +80,7 @@ conf = Configure(env,{'checkForCCOption':checkForCCOption,
 		      'checkForBuildingClients':checkForBuildingClients,
 		      'checkForSGMLFMT':checkForSGMLFMT
 	 	      })
+if not conf.CheckCC(): Exit(1)
 # check for CC options
 for option in Split("""
       -Wall -W -Wstrict-prototypes -Wmissing-prototypes -Wshadow