diff --git a/internal/rosa/llvm_test.go b/internal/rosa/llvm_test.go
index 0a09ff2f..af5f6530 100644
--- a/internal/rosa/llvm_test.go
+++ b/internal/rosa/llvm_test.go
@@ -8,7 +8,7 @@ import (
 )
 
 func TestLLVMInputs(t *testing.T) {
-	const wantInputCount = 467
+	const wantInputCount = 473
 
 	_, llvm := rosa.Native().Std().MustLoad(rosa.H("llvm"))
 	var n int
diff --git a/internal/rosa/package/awk.az b/internal/rosa/package/awk.az
index fed7910c..8f97fa04 100644
--- a/internal/rosa/package/awk.az
+++ b/internal/rosa/package/awk.az
@@ -18,13 +18,14 @@ package awk {
 		omitDefaults = true;
 		inPlace = true;
 		skipConfigure = true;
+		make = [ "YACC='yacc -d -b awkgram'" ];
 		preCheck = "install -vD a.out /system/bin/awk\n";
 		install = "install -vD a.out /work/system/bin/awk";
 	};
 
 	inputs = [
 		m4,
-		bison,
+		byacc,
 		diffutils,
 	];
 }
diff --git a/internal/rosa/package/bison.az b/internal/rosa/package/bison.az
index 4f7dd796..c732ed1b 100644
--- a/internal/rosa/package/bison.az
+++ b/internal/rosa/package/bison.az
@@ -10,9 +10,6 @@ package bison {
 		compress = gzip;
 	};
 
-	// awk dependency loop
-	toyboxEarly = true;
-
 	exec = make {
 		check = [
 			"TESTSUITEFLAGS=" + jobsFlagE + "' " + skipGNUTests {
@@ -27,5 +24,6 @@ package bison {
 		];
 	};
 
+	toyboxEarly = true;
 	inputs = [ m4 ];
 }
diff --git a/internal/rosa/package/byacc.az b/internal/rosa/package/byacc.az
new file mode 100644
index 00000000..e79bb1ba
--- /dev/null
+++ b/internal/rosa/package/byacc.az
@@ -0,0 +1,22 @@
+package byacc {
+	description = "Berkeley Yacc";
+	website = "https://invisible-island.net/byacc";
+	anitya = 233;
+
+	version# = "20260126";
+	source = remoteTar {
+		url = "https://invisible-island.net/archives/byacc/"+
+			"byacc-"+version+".tgz";
+		compress = gzip;
+		checksum = "3IXzewZmFUW3hkFKBuweR0hUSftlI2zE0lBZf16I8oK3mFEyj51FzVv1wvA12uoC";
+	};
+
+	// awk dependency loop
+	toyboxEarly = true;
+
+	// test suite assumes writable source
+	writable = true;
+	chmod = true;
+
+	exec = make {};
+}
diff --git a/internal/rosa/package/gnu.az b/internal/rosa/package/gnu.az
index c1547f37..d1da6b8a 100644
--- a/internal/rosa/package/gnu.az
+++ b/internal/rosa/package/gnu.az
@@ -12,9 +12,6 @@ package m4 {
 		compress = bzip2;
 	};
 
-	// awk dependency loop
-	toyboxEarly = true;
-
 	writable = true;
 	early = `
 chmod +w tests/test-c32ispunct.sh && echo '#!/bin/sh' > tests/test-c32ispunct.sh
@@ -22,6 +19,7 @@ chmod +w tests/test-c32ispunct.sh && echo '#!/bin/sh' > tests/test-c32ispunct.sh
 
 	exec = make {};
 
+	toyboxEarly = true;
 	inputs = [
 		diffutils,
 
diff --git a/internal/rosa/package/iproute2.az b/internal/rosa/package/iproute2.az
index 2804ebab..c759fec6 100644
--- a/internal/rosa/package/iproute2.az
+++ b/internal/rosa/package/iproute2.az
@@ -28,7 +28,7 @@ package iproute2 {
 			"prefix": "/system";
 			"color": "auto";
 		};
-		make = [ "CC=cc" ];
+		make = [ "CC=cc", "YACC=yacc" ];
 		// wants root
 		skipCheck = true;
 	};
@@ -36,7 +36,7 @@ package iproute2 {
 	inputs = [
 		pkg-config,
 		m4,
-		bison,
+		byacc,
 		flex,
 
 		libbpf,
diff --git a/internal/rosa/package/x.az b/internal/rosa/package/x.az
index cb5e51f6..845f479e 100644
--- a/internal/rosa/package/x.az
+++ b/internal/rosa/package/x.az
@@ -562,7 +562,7 @@ package xkbcomp {
 		automake,
 		libtool,
 		pkg-config,
-		bison,
+		byacc,
 
 		util-macros,
 		libxkbfile,