diff --git a/src/fop.rs b/src/fop.rs
index 66b7e82..7c8424e 100644
--- a/src/fop.rs
+++ b/src/fop.rs
@@ -39,7 +39,7 @@ fn main() {
 	let mut d = '\u{1E}'.to_string(); /* ASCII record separator */
 	let mut optind = 1;
 
-	if cfg!(target_os="openbsd") {
+	#[cfg(target_os="openbsd")] {
 		let promises = Promises::new("stdio proc exec");
 		if let Err(e) = pledge(Some(promises), None) {
 			eprintln!("{}: {}", argv[0], e.strerror());
diff --git a/src/hru.rs b/src/hru.rs
index c6009a7..e07ec39 100644
--- a/src/hru.rs
+++ b/src/hru.rs
@@ -86,7 +86,7 @@ fn main() -> ExitCode {
 		return ExitCode::from(EX_USAGE as u8);
 	}
 
-	if cfg!(target_os="openbsd") {
+	#[cfg(target_os="openbsd")] {
 		let promises = Promises::new("stdio");
 		if let Err(e) = pledge(Some(promises), None) {
 			eprintln!("{}: {}", argv[0], e.strerror());
diff --git a/src/intcmp.rs b/src/intcmp.rs
index a7c045d..456f268 100644
--- a/src/intcmp.rs
+++ b/src/intcmp.rs
@@ -42,7 +42,7 @@ fn usage(s: &str) -> ExitCode {
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
 
-	if cfg!(target_os="openbsd") {
+	#[cfg(target_os="openbsd")] {
 		let promises = Promises::new("stdio");
 		if let Err(e) = pledge(Some(promises), None) {
 			eprintln!("{}: {}", argv[0], e.strerror());
diff --git a/src/mm.rs b/src/mm.rs
index aee9aa2..10c6ef2 100644
--- a/src/mm.rs
+++ b/src/mm.rs
@@ -51,7 +51,7 @@ fn main() -> ExitCode {
 	let argv = args().collect::<Vec<_>>();
 	let usage = format!("Usage: {} [-aetu] [-i input] [-o output]", argv[0]);
 
-	if cfg!(target_os="openbsd") {
+	#[cfg(target_os="openbsd")] {
 		let promises = Promises::new("cpath rpath stdio unveil wpath");
 		if let Err(e) = pledge(Some(promises), None) {
 			eprintln!("{}: {}", argv[0], e.strerror());
@@ -80,7 +80,7 @@ fn main() -> ExitCode {
 				mode = Some(In); /* latest argument == -i */
 			},
 			Ok("o") => { /* add output */
-				let output = opt.arg().unwrap(); 
+				let output = opt.arg().unwrap();
 				outs.push(output);
 				mode = Some(Out); /* latest argument == -o */
 			},
@@ -106,8 +106,7 @@ fn main() -> ExitCode {
 		}
 	}
 
-	if cfg!(target_os="openbsd") {
-
+	#[cfg(target_os="openbsd")] {
 		for input in &ins {
 			let perms = UnveilPerms::new(vec!['r']);
 
diff --git a/src/rpn.rs b/src/rpn.rs
index e4f725d..7669efb 100644
--- a/src/rpn.rs
+++ b/src/rpn.rs
@@ -198,7 +198,7 @@ fn round_precise(value: &f64, precision: usize) -> f64 {
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
 
-	if cfg!(target_os="openbsd") {
+	#[cfg(target_os="openbsd")] {
 		let promises = Promises::new("stdio");
 		if let Err(e) = pledge(Some(promises), None) {
 			eprintln!("{}: {}", argv[0], e.strerror());
diff --git a/src/swab.rs b/src/swab.rs
index 27ce9a5..4dc86de 100644
--- a/src/swab.rs
+++ b/src/swab.rs
@@ -54,7 +54,7 @@ fn usage(s: &str) -> ExitCode {
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
 	
-	if cfg!(target_os="openbsd") {
+	#[cfg(target_os="openbsd")] {
 		let promises = Promises::new("stdio");
 		if let Err(e) = pledge(Some(promises), None) {
 			return oserr(&argv[0], e);
diff --git a/tests/bonsai/dj.mk b/tests/bonsai/dj.mk
index bf8adf3..2b4ef6b 100755
--- a/tests/bonsai/dj.mk
+++ b/tests/bonsai/dj.mk
@@ -19,7 +19,7 @@ dj_tests: dj_help dj_full dj_null # dj_skip_stdin
 dj_full: $(BIN)/dj /dev/full
 	case "$$(uname)" in \
 	Linux) \
-		$(BIN)/dj -Hi /dev/zero -o /dev/full 2>&1 \
+		! $(BIN)/dj -Hi /dev/zero -o /dev/full 2>&1 \
 			| tee /dev/stderr \
 			| xargs -I out test '1+0 > 0+0; 1024 > 0' = out \
 		;; \
diff --git a/tests/bonsai/npc.mk b/tests/bonsai/npc.mk
index 8b10fdf..b028c4d 100755
--- a/tests/bonsai/npc.mk
+++ b/tests/bonsai/npc.mk
@@ -32,11 +32,29 @@ npc_ascii: npc_ascii_controls npc_ascii_symbols npc_ascii_uppers # \
 .PHONY: npc_ascii_controls
 # (control characters)
 npc_ascii_controls:
+	# The following test prints the bytes 0x00 (inclusive) through 0x20
+	# (exclusive) and pipes them through npc(1). npc(1) should then replace all
+	# non-printing, non-space (in the isspace(3p) sense) characters with their
+	# graphical carat-char counterparts (see the npc(1) man page). The head(1p)
+	# invocation then strips off everything past the first line (or past the
+	# first newline byte, 0x0A) and xargs(1p) is used to test(1p) the output
+	# against the known good answer.
+
+	# Immediately before that newline, 0x09 is printed - in ASCII, the
+	# horizontal tab. If xargs' -I option is used, tr(1p) should used to delete
+	# that tab. If the tab is left as part of input, OpenBSD's xargs(1)
+	# implementation has been observed to strip it along with the other
+	# trailing whitespace (the newline), but Busybox's and GNU's xargs(1)
+	# implementations have been observed to leave the tab in. All three
+	# implementations strip off the trailing tab if `-I` is not used. The POSIX
+	# specification for `-I` is ambiguous as to which behavior is correct.
+	# This comment is the result of much bewilderment and debugging.
+
 	# ASCII 0x00 to 0x0a (before the newline, due to xargs(1p) issues)
 	awk 'BEGIN{ for (i = 0; i < 32; ++i) printf("%c", i); }' \
 		| $(BIN)/npc \
 		| head -n 1 \
-		| xargs -I out test "^@^A^B^C^D^E^F^G^H" = out
+		| xargs test "^@^A^B^C^D^E^F^G^H" =
 
 	# ASCII 0x0a (otherwise the head|tail sequence won't work) to 0x1f
 	awk 'BEGIN{ for (i = 0; i < 32; ++i) printf("%c", i); print }' \
diff --git a/tests/bonsai/rpn.mk b/tests/bonsai/rpn.mk
index 3619692..6fecab9 100755
--- a/tests/bonsai/rpn.mk
+++ b/tests/bonsai/rpn.mk
@@ -30,7 +30,7 @@ rpn_mul: $(BIN)/rpn
 .PHONY: rpn_div
 rpn_div: $(BIN)/rpn
 	test "$$($(BIN)/rpn 12 5 /)" = 2.4
-	test "$$($(BIN)/rpn 3 0 /)" -eq inf
+	test "$$($(BIN)/rpn 3 0 /)" = inf
 
 .PHONY: rpn_mod
 rpn_mod: $(BIN)/rpn