src/errors.txt is used to generate src/errors.cc

--- src/errors.txt.orig	2018-07-07 20:48:53 UTC
+++ src/errors.txt
@@ -14,7 +14,7 @@ _ErrMsg(_ErrEnum)
 
 ////////////////////////////////////////////////////////////////////////////
 
-Copyright               SIMLIB/C++ Simulation Library, "SIMLIB_COPYRIGHT"
+Copyright               SIMLIB/C++ Simulation Library, " SIMLIB_COPYRIGHT "
 UnknownError            Undocumented error
 InternalError           Internal error
 MemoryError             No memory