diff --git a/src/nasal_new_builtin.cpp b/src/nasal_new_builtin.cpp
index a1bea78..da79b39 100644
--- a/src/nasal_new_builtin.cpp
+++ b/src/nasal_new_builtin.cpp
@@ -1,4 +1,4 @@
-#include "nasal_new_builtin.h"
+#include "nasal_new_builtin.h"
 
 var builtin_print(var* local, gc& ngc) {
     for(auto& i:local[1].vec().elems) {
@@ -1263,4 +1263,99 @@ var builtin_ghosttype(var* local, gc& ngc) {
         return var::num((u64)arg.obj().ptr);
     }
     return ngc.newstr(name);
-}
\ No newline at end of file
+}
+
+nasal_builtin_table builtin[] = {
+    {"__print",   builtin_print   },
+    {"__println", builtin_println },
+    {"__exit",    builtin_exit    },
+    {"__abort",   builtin_abort   },
+    {"__append",  builtin_append  },
+    {"__setsize", builtin_setsize },
+    {"__system",  builtin_system  },
+    {"__input",   builtin_input   },
+    {"__readfile",builtin_readfile},
+    {"__fout",    builtin_fout    },
+    {"__split",   builtin_split   },
+    {"__rand",    builtin_rand    },
+    {"__id",      builtin_id      },
+    {"__int",     builtin_int     },
+    {"__floor",   builtin_floor   },
+    {"__num",     builtin_num     },
+    {"__pop",     builtin_pop     },
+    {"__str",     builtin_str     },
+    {"__size",    builtin_size    },
+    {"__u32xor",  builtin_u32xor  },
+    {"__u32and",  builtin_u32and  },
+    {"__u32or",   builtin_u32or   },
+    {"__u32nand", builtin_u32nand },
+    {"__u32not",  builtin_u32not  },
+    {"__pow",     builtin_pow     },
+    {"__sin",     builtin_sin     },
+    {"__cos",     builtin_cos     },
+    {"__tan",     builtin_tan     },
+    {"__exp",     builtin_exp     },
+    {"__lg",      builtin_lg      },
+    {"__ln",      builtin_ln      },
+    {"__sqrt",    builtin_sqrt    },
+    {"__atan2",   builtin_atan2   },
+    {"__isnan",   builtin_isnan   },
+    {"__time",    builtin_time    },
+    {"__contains",builtin_contains},
+    {"__delete",  builtin_delete  },
+    {"__keys",    builtin_keys    },
+    {"__die",     builtin_die     },
+    {"__find",    builtin_find    },
+    {"__type",    builtin_type    },
+    {"__substr",  builtin_substr  },
+    {"__streq",   builtin_streq   },
+    {"__left",    builtin_left    },
+    {"__right",   builtin_right   },
+    {"__cmp",     builtin_cmp     },
+    {"__chr",     builtin_chr     },
+    {"__char",    builtin_char    },
+    {"__values",  builtin_values  },
+    {"__exists",  builtin_exists  },
+    {"__open",    builtin_open    },
+    {"__close",   builtin_close   },
+    {"__read",    builtin_read    },
+    {"__write",   builtin_write   },
+    {"__seek",    builtin_seek    },
+    {"__tell",    builtin_tell    },
+    {"__readln",  builtin_readln  },
+    {"__stat",    builtin_stat    },
+    {"__eof",     builtin_eof     },
+    {"__fld",     builtin_fld     },
+    {"__sfld",    builtin_sfld    },
+    {"__setfld",  builtin_setfld  },
+    {"__buf",     builtin_buf     },
+    {"__sleep",   builtin_sleep   },
+    {"__pipe",    builtin_pipe    },
+    {"__fork",    builtin_fork    },
+    {"__waitpid", builtin_waitpid },
+    {"__opendir", builtin_opendir },
+    {"__readdir", builtin_readdir },
+    {"__closedir",builtin_closedir},
+    {"__chdir",   builtin_chdir   },
+    {"__environ", builtin_environ },
+    {"__getcwd",  builtin_getcwd  },
+    {"__getenv",  builtin_getenv  },
+    {"__dlopen",  builtin_dlopen  },
+    {"__dlclose", builtin_dlclose },
+    {"__dlcallv", builtin_dlcallv },
+    {"__dlcall",  builtin_dlcall  },
+    {"__platform",builtin_platform},
+    {"__arch",    builtin_arch    },
+    {"__md5",     builtin_md5     },
+    {"__cocreate",builtin_cocreate},
+    {"__coresume",builtin_coresume},
+    {"__coyield", builtin_coyield },
+    {"__costatus",builtin_costatus},
+    {"__corun"   ,builtin_corun   },
+    {"__millisec",builtin_millisec},
+    {"__sysargv", builtin_sysargv },
+    {"__gcextd",  builtin_gcextend},
+    {"__logtime", builtin_logtime },
+    {"__ghosttype", builtin_ghosttype},
+    {nullptr,     nullptr         }
+};
\ No newline at end of file
diff --git a/src/nasal_new_builtin.h b/src/nasal_new_builtin.h
index ec983f8..f372127 100644
--- a/src/nasal_new_builtin.h
+++ b/src/nasal_new_builtin.h
@@ -131,100 +131,9 @@ var builtin_ghosttype(var*, gc&);
 
 // register builtin function's name and it's address here in this table below
 // this table must end with {nullptr,nullptr}
-struct {
+struct nasal_builtin_table {
     const char* name;
     var (*func)(var*,gc&);
-} builtin[]= {
-    {"__print",   builtin_print   },
-    {"__println", builtin_println },
-    {"__exit",    builtin_exit    },
-    {"__abort",   builtin_abort   },
-    {"__append",  builtin_append  },
-    {"__setsize", builtin_setsize },
-    {"__system",  builtin_system  },
-    {"__input",   builtin_input   },
-    {"__readfile",builtin_readfile},
-    {"__fout",    builtin_fout    },
-    {"__split",   builtin_split   },
-    {"__rand",    builtin_rand    },
-    {"__id",      builtin_id      },
-    {"__int",     builtin_int     },
-    {"__floor",   builtin_floor   },
-    {"__num",     builtin_num     },
-    {"__pop",     builtin_pop     },
-    {"__str",     builtin_str     },
-    {"__size",    builtin_size    },
-    {"__u32xor",  builtin_u32xor  },
-    {"__u32and",  builtin_u32and  },
-    {"__u32or",   builtin_u32or   },
-    {"__u32nand", builtin_u32nand },
-    {"__u32not",  builtin_u32not  },
-    {"__pow",     builtin_pow     },
-    {"__sin",     builtin_sin     },
-    {"__cos",     builtin_cos     },
-    {"__tan",     builtin_tan     },
-    {"__exp",     builtin_exp     },
-    {"__lg",      builtin_lg      },
-    {"__ln",      builtin_ln      },
-    {"__sqrt",    builtin_sqrt    },
-    {"__atan2",   builtin_atan2   },
-    {"__isnan",   builtin_isnan   },
-    {"__time",    builtin_time    },
-    {"__contains",builtin_contains},
-    {"__delete",  builtin_delete  },
-    {"__keys",    builtin_keys    },
-    {"__die",     builtin_die     },
-    {"__find",    builtin_find    },
-    {"__type",    builtin_type    },
-    {"__substr",  builtin_substr  },
-    {"__streq",   builtin_streq   },
-    {"__left",    builtin_left    },
-    {"__right",   builtin_right   },
-    {"__cmp",     builtin_cmp     },
-    {"__chr",     builtin_chr     },
-    {"__char",    builtin_char    },
-    {"__values",  builtin_values  },
-    {"__exists",  builtin_exists  },
-    {"__open",    builtin_open    },
-    {"__close",   builtin_close   },
-    {"__read",    builtin_read    },
-    {"__write",   builtin_write   },
-    {"__seek",    builtin_seek    },
-    {"__tell",    builtin_tell    },
-    {"__readln",  builtin_readln  },
-    {"__stat",    builtin_stat    },
-    {"__eof",     builtin_eof     },
-    {"__fld",     builtin_fld     },
-    {"__sfld",    builtin_sfld    },
-    {"__setfld",  builtin_setfld  },
-    {"__buf",     builtin_buf     },
-    {"__sleep",   builtin_sleep   },
-    {"__pipe",    builtin_pipe    },
-    {"__fork",    builtin_fork    },
-    {"__waitpid", builtin_waitpid },
-    {"__opendir", builtin_opendir },
-    {"__readdir", builtin_readdir },
-    {"__closedir",builtin_closedir},
-    {"__chdir",   builtin_chdir   },
-    {"__environ", builtin_environ },
-    {"__getcwd",  builtin_getcwd  },
-    {"__getenv",  builtin_getenv  },
-    {"__dlopen",  builtin_dlopen  },
-    {"__dlclose", builtin_dlclose },
-    {"__dlcallv", builtin_dlcallv },
-    {"__dlcall",  builtin_dlcall  },
-    {"__platform",builtin_platform},
-    {"__arch",    builtin_arch    },
-    {"__md5",     builtin_md5     },
-    {"__cocreate",builtin_cocreate},
-    {"__coresume",builtin_coresume},
-    {"__coyield", builtin_coyield },
-    {"__costatus",builtin_costatus},
-    {"__corun"   ,builtin_corun   },
-    {"__millisec",builtin_millisec},
-    {"__sysargv", builtin_sysargv },
-    {"__gcextd",  builtin_gcextend},
-    {"__logtime", builtin_logtime },
-    {"__ghosttype", builtin_ghosttype},
-    {nullptr,     nullptr         }
 };
+
+extern nasal_builtin_table builtin[];
diff --git a/src/nasal_new_gc.h b/src/nasal_new_gc.h
index 7e94558..fe84ae9 100644
--- a/src/nasal_new_gc.h
+++ b/src/nasal_new_gc.h
@@ -27,6 +27,8 @@
 #include <chrono>
 #include <algorithm>
 #include <thread>
+#include <cstring>
+#include <sstream>
 
 #include "nasal_new_header.h"