Index: src/amiga-library.h
==================================================================
--- src/amiga-library.h
+++ src/amiga-library.h
@@ -23,10 +23,14 @@
 #else
 # define OF_M68K_ARG(type, name, reg)		\
 	register type reg_##name __asm__(#reg);	\
 	type name = reg_##name;
 #endif
+
+#ifdef OF_MORPHOS
+# include <setjmp.h>
+#endif
 
 typedef void (*OFSignalHandler)(int);
 
 struct OFLibC {
 	/*
@@ -97,12 +101,16 @@
 	int (*_Nonnull atexit)(void (*_Nonnull)(void));
 	OFSignalHandler _Nullable (*_Nonnull signal)(int, OFSignalHandler _Nullable);
 	char *_Nullable (*_Nonnull setlocale)(int, const char *_Nullable);
 	int (*_Nonnull _Unwind_Backtrace)(int (*_Nonnull)(void *_Nonnull,
 	    void *_Null_unspecified), void *_Null_unspecified);
+#ifdef OF_MORPHOS
+	int (*_Nonnull setjmp)(jmp_buf);
+	void __dead2 (*_Nonnull longjmp)(jmp_buf, int);
+#endif
 };
 
 extern bool OFInit(unsigned int version, struct OFLibC *_Nonnull libC,
     FILE *_Nonnull *_Nonnull sF);
 extern unsigned long *OFHashSeedRef(void);
 extern void OFPBKDF2Wrapper(const OFPBKDF2Parameters *_Nonnull parameters);
 extern void OFScryptWrapper(const OFScryptParameters *_Nonnull parameters);

Index: src/amiga-library.m
==================================================================
--- src/amiga-library.m
+++ src/amiga-library.m
@@ -629,10 +629,24 @@
 int
 _Unwind_Backtrace(int (*callback)(void *, void *), void *data)
 {
 	return libC._Unwind_Backtrace(callback, data);
 }
+
+#ifdef OF_MORPHOS
+int
+setjmp(jmp_buf env)
+{
+	return libC.setjmp(env);
+}
+
+void
+longjmp(jmp_buf env, int val)
+{
+	libC.longjmp(env, val);
+}
+#endif
 
 void
 OFPBKDF2Wrapper(const OFPBKDF2Parameters *parameters)
 {
 	OFPBKDF2(*parameters);