--- a/uninit.c

+++ b/uninit.c

@@ -234,7 +234,14 @@ which we want*/

 #endif /*Can_use__setfpucw*/

-#else /* !(mc68000||powerpc) */

+#elif defined(__riscv)

+/* RISC-V does not generate traps on floating-point exceptions,

+so it's not possible to enable them */

+        fflush(stdout);

+        fprintf(stderr, "\nf2c's -trapuv option is not supported on RISC-V\n");

+        exit(-1);

+

+#else /* !(mc68000||powerpc||riscv) */

 #ifdef _FPU_IEEE

 #ifndef _FPU_EXTENDED /* e.g., ARM processor under Linux */