The Quake III Arena sources as originally released under the GPL license on August 20, 2005.

lcc/include/mips/irix/signal.h

@@ -0,0 +1,20 @@
+#ifndef __SIGNAL
+#define __SIGNAL
+
+typedef int sig_atomic_t;
+
+#define SIG_DFL ((void (*)(int))0)
+#define SIG_ERR ((void (*)(int))-1)
+#define SIG_IGN ((void (*)(int))1)
+
+#define SIGABRT	6
+#define SIGFPE	8
+#define SIGILL	4
+#define SIGINT	2
+#define SIGSEGV	11
+#define SIGTERM	15
+
+void (*signal(int, void (*)(int)))(int);
+int raise(int);
+
+#endif /* __SIGNAL */