--- 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 */