--- library.js.orig	2019-03-02 16:08:24.404047130 +0100
+++ library.js	2019-03-02 16:19:30.588047130 +0100
@@ -291,7 +291,7 @@
     // pid_t fork(void);
     // http://pubs.opengroup.org/onlinepubs/000095399/functions/fork.html
     // We don't support multiple processes.
-    ___setErrNo({{{ cDefine('EAGAIN') }}});
+    ___setErrNo({{{ cDefine('ENOTSUP') }}});
     return -1;
   },
   vfork: 'fork',
@@ -817,7 +817,7 @@
     // int system(const char *command);
     // http://pubs.opengroup.org/onlinepubs/000095399/functions/system.html
     // Can't call external programs.
-    ___setErrNo({{{ cDefine('EAGAIN') }}});
+    ___setErrNo({{{ cDefine('ENOTSUP') }}});
     return -1;
   },