diff --git a/packages/byacc/pkgbuild.py b/packages/byacc/pkgbuild.py
new file mode 100644
index 0000000..3fee848
--- /dev/null
+++ b/packages/byacc/pkgbuild.py
@@ -0,0 +1,22 @@
+import os
+
+from lib import cpp
+from lib.make import *
+
+version("2.0")
+source_url("https://www.invisible-island.net/archives/byacc/byacc-2.0.tgz")
+
+
+def build():
+    cpp.configure([f"--prefix={get_prefix('byacc')}", "--enable-btyacc"])
+    cpp.make()
+    cpp.make_install()
+    os.rename("bin/yacc", "bin/byacc")
+
+
+on_build(build)
+
+package("byacc")
+dep("semi-libc @same-arch")
+cpp.use_auto_pack(["bin", "lib", "dev"])
+link("bin/byacc", "/bin/yacc")