Fix:

fxposix.ri:2077:4: error: redefinition of 'curtstate'
   CURTSTATE();
   ^

https://github.com/uniconproject/unicon/commit/50c3705fafdba2a40ed464af660183f48ec24cfe
--- src/runtime/fxposix.ri.orig
+++ src/runtime/fxposix.ri
@@ -2074,7 +2074,9 @@ end
    body {
      tended char* fstr;
      int af_fam;
+#if !ConcurrentCOMPILER
       CURTSTATE();
+#endif					/* ConcurrentCOMPILER */
       if (is:null(fam)){
 	af_fam = AF_INET;
       } else {
