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diff --git a/lib/libc/riscv/gen/fpsetmask.c b/lib/libc/riscv/gen/fpsetmask.c
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index 000000000000..024f1fd8d8bc
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+++ b/lib/libc/riscv/gen/fpsetmask.c
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+/*-
+ * Copyright (c) 2020 Axiado
+ * All rights reserved.
+ *
+ * This software was developed by Kristof Provost under
+ * sponsorship from Axiado.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <ieeefp.h>
+
+/**
+ * RISC-V doesn't support floating-point exceptions: RISC-V Instruction Set
+ * Manual: Volume I: User-Level ISA, 11.2 Floating-Point Control and Status
+ * Register: "As allowed by the standard, we do not support traps on
+ * floating-point exceptions in the base ISA, but instead require explicit
+ * checks of the flags in software. We considered adding branches controlled
+ * directly by the contents of the floating-point accrued exception flags, but
+ * ultimately chose to omit these instructions to keep the ISA simple." 
+ *
+ * We still need this function, because some applications (notably Perl) call
+ * it, but we cannot provide a meaningful implementation.
+ **/
+fp_except_t
+fpsetmask(fp_except_t mask)
+{
+
+	return (0);
+}