setjmp/longjmp are used to jump out of signal handlers. That
causes weirdness. Use sigsetjmp/siglongjmp.

diff -ruN t/elvis-tiny-1.4/main.c elvis-tiny-1.4/main.c
--- t/elvis-tiny-1.4/main.c	2008-04-30 23:09:50.000000000 +0200
+++ elvis-tiny-1.4/main.c	2008-04-30 22:54:52.000000000 +0200
@@ -17,7 +17,7 @@
 
 extern		trapint(); /* defined below */
 extern char	*getenv();
-jmp_buf		jmpenv;
+sigjmp_buf	jmpenv;
 
 #ifndef NO_DIGRAPH
 static init_digraphs();
@@ -307,7 +307,7 @@
 	 */
 	while (mode != MODE_QUIT)
 	{
-		if (setjmp(jmpenv))
+		if (sigsetjmp(jmpenv, 1))
 		{
 			/* Maybe we just aborted a change? */
 			abortdo();
@@ -368,7 +368,7 @@
 #else
 	signal(signo, trapint);
 #endif
-	longjmp(jmpenv, 1);
+	siglongjmp(jmpenv, 1);
 
 	return 0;
 }
diff -ruN t/elvis-tiny-1.4/tio.c elvis-tiny-1.4/tio.c
--- t/elvis-tiny-1.4/tio.c	2008-04-30 23:09:50.000000000 +0200
+++ elvis-tiny-1.4/tio.c	2008-04-30 22:54:57.000000000 +0200
@@ -347,10 +347,10 @@
 
 #if !MSDOS && !TOS
 # if BSD || COHERENT
-static jmp_buf env_timeout;
+static sigjmp_buf env_timeout;
 static int dummy()
 {
-	longjmp(env_timeout, 1);
+	siglongjmp(env_timeout, 1);
 	return 0;
 }
 # else 
@@ -549,7 +549,7 @@
 	while (j > 1)
 	{
 #if BSD || COHERENT
-		if (setjmp(env_timeout))
+		if (sigsetjmp(env_timeout, 1))
 		{
 			/* we timed out - assume no mapping */
 			j = 0;