Description: Turn #error into exceptions

 So the library can be built on non-Linux platforms too, although can't

 guarauntee its functionality regarding that piece of code.

--- a/base/file.cpp

+++ b/base/file.cpp

@@ -422,7 +422,8 @@

   path[PATH_MAX - 1] = 0;

   return path;

 #else

-#error unknown OS

+#include <stdexcept>

+  throw std::runtime_error(std::string("Unknown OS!"));

 #endif

 }