+#else
+
+extern int gcpro_level;
+
+#define GCPRO1(varname) \
+ {gcpro1.next = gcprolist; gcpro1.var = &varname; gcpro1.nvars = 1; \
+ gcpro1.level = gcpro_level++; \
+ gcprolist = &gcpro1; }
+
+#define GCPRO2(varname1, varname2) \
+ {gcpro1.next = gcprolist; gcpro1.var = &varname1; gcpro1.nvars = 1; \
+ gcpro1.level = gcpro_level; \
+ gcpro2.next = &gcpro1; gcpro2.var = &varname2; gcpro2.nvars = 1; \
+ gcpro2.level = gcpro_level++; \
+ gcprolist = &gcpro2; }
+
+#define GCPRO3(varname1, varname2, varname3) \
+ {gcpro1.next = gcprolist; gcpro1.var = &varname1; gcpro1.nvars = 1; \
+ gcpro1.level = gcpro_level; \
+ gcpro2.next = &gcpro1; gcpro2.var = &varname2; gcpro2.nvars = 1; \
+ gcpro3.next = &gcpro2; gcpro3.var = &varname3; gcpro3.nvars = 1; \
+ gcpro3.level = gcpro_level++; \
+ gcprolist = &gcpro3; }
+
+#define GCPRO4(varname1, varname2, varname3, varname4) \
+ {gcpro1.next = gcprolist; gcpro1.var = &varname1; gcpro1.nvars = 1; \
+ gcpro1.level = gcpro_level; \
+ gcpro2.next = &gcpro1; gcpro2.var = &varname2; gcpro2.nvars = 1; \
+ gcpro3.next = &gcpro2; gcpro3.var = &varname3; gcpro3.nvars = 1; \
+ gcpro4.next = &gcpro3; gcpro4.var = &varname4; gcpro4.nvars = 1; \
+ gcpro4.level = gcpro_level++; \
+ gcprolist = &gcpro4; }
+
+#define GCPRO5(varname1, varname2, varname3, varname4, varname5) \
+ {gcpro1.next = gcprolist; gcpro1.var = &varname1; gcpro1.nvars = 1; \
+ gcpro1.level = gcpro_level; \
+ gcpro2.next = &gcpro1; gcpro2.var = &varname2; gcpro2.nvars = 1; \
+ gcpro3.next = &gcpro2; gcpro3.var = &varname3; gcpro3.nvars = 1; \
+ gcpro4.next = &gcpro3; gcpro4.var = &varname4; gcpro4.nvars = 1; \
+ gcpro5.next = &gcpro4; gcpro5.var = &varname5; gcpro5.nvars = 1; \
+ gcpro5.level = gcpro_level++; \
+ gcprolist = &gcpro5; }
+
+#define UNGCPRO \
+ ((--gcpro_level != gcpro1.level) \
+ ? (abort (), 0) \
+ : ((gcprolist = gcpro1.next), 0))
+
+#endif /* DEBUG_GCPRO */
+#endif /* GC_MARK_STACK != GC_MAKE_GCPROS_NOOPS */