--- a/libpolyml/polyffi.cpp	2019-04-05 23:10:23.509729312 +0200
+++ b/libpolyml/polyffi.cpp	2019-04-05 23:10:38.895485058 +0200
@@ -89,7 +89,6 @@
 // Unfortunately the ABI entries are enums rather than #defines so we
 // can't test individual entries.
 #ifdef X86_WIN32
-    {"sysv", FFI_SYSV},
     {"stdcall", FFI_STDCALL},
     {"thiscall", FFI_THISCALL},
     {"fastcall", FFI_FASTCALL},
@@ -97,7 +96,6 @@
 #elif defined(X86_WIN64)
     {"win64", FFI_WIN64},
 #elif defined(X86_ANY)
-    {"sysv", FFI_SYSV},
     {"unix64", FFI_UNIX64},
 #endif
     { "default", FFI_DEFAULT_ABI}