cmake does not require two arguments

Source/cmakemain.cxx

@@ -3,11 +3,6 @@
 int main(int ac, char** av)
 {
   cmake cm;
-  if(ac < 1)
-    {
-      cm.Usage(av[0]);
-      return -1;
-    }
   std::vector<std::string> args;
   for(int i =0; i < ac; ++i)
     {