BUG: Fix bug#4482.

Source/kwsys/SystemTools.cxx

@@ -2693,13 +2693,24 @@ kwsys_stl::string SystemTools::RelativePath(const char* local, const char* remot
     remoteSplit[sameCount] = "";
     sameCount++;
     }
+
+#if 0
+  // NOTE: We did this at one time to prevent relative paths to the
+  // compiler from looking like "../../../../../../../usr/bin/gcc".
+  // Now however relative paths are only computed for destinations
+  // inside the build tree so this is not a problem.  This is now a
+  // general-purpose method and should not have this hack.  I'm
+  // leaving it in place in case removing it causes a problem so it is
+  // easy to restore:
+  //
   // If there is nothing in common but the root directory, then just
   // return the full path.
   if(sameCount <= 1)
     {
     return remote;
     }
-  
+#endif
+
   // for each entry that is not common in the local path
   // add a ../ to the finalpath array, this gets us out of the local
   // path into the remote dir