diff --git a/selfhost/cmd/ww/main.combined.ww b/selfhost/cmd/ww/main.combined.ww
index a24f473c..0f37ea44 100644
--- a/selfhost/cmd/ww/main.combined.ww
+++ b/selfhost/cmd/ww/main.combined.ww
@@ -2724,8 +2724,9 @@ import rt;
 import strings;
 
 // All path/string scratch buffers go on the runtime page allocator.
-// One page is plenty for any path we build.
-def PATH_MAX:    u64 = 4096u64;
+// One page is plenty for any path we build. PATH_MAX lives in lib/os
+// (os.PATH_MAX: i32 = 4096) — the duplicate u64 def was dropped to close
+// the cgen #127 mod-mangle attribution bug consumer per rule-7.
 def CMD_MAX:     u64 = 8192u64;
 
 // ---- C-string helpers --------------------------------------------------
@@ -2845,8 +2846,8 @@ fn selfdirinto(dst: *u8, dstsz: u64, argv0: *u8) void = {
 
 // Build "$dir/$name" (NUL-terminated) into a fresh page-sized buffer.
 fn joinpath(dir: *u8, name: *u8) *u8 = {
-	let buf: []u8 = alloc([], PATH_MAX)!;
-	buf.len = PATH_MAX: i32;
+	let buf: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	buf.len = os.PATH_MAX;
 	let off: u64 = cstrinto(buf.ptr, 0u64, dir);
 	off = byteinto(buf.ptr, off, 47u8);
 	off = cstrinto(buf.ptr, off, name);
@@ -2856,8 +2857,8 @@ fn joinpath(dir: *u8, name: *u8) *u8 = {
 
 // Same, but the second component is a ww `str` literal.
 fn joinpathlit(dir: *u8, name: str) *u8 = {
-	let buf: []u8 = alloc([], PATH_MAX)!;
-	buf.len = PATH_MAX: i32;
+	let buf: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	buf.len = os.PATH_MAX;
 	let off: u64 = cstrinto(buf.ptr, 0u64, dir);
 	off = byteinto(buf.ptr, off, 47u8);
 	off = strinto(buf.ptr, off, name);
@@ -2960,7 +2961,7 @@ fn importpathform(name: *u8, namelen: u64) *u8 = {
 // `foo/foo.ha` fallback; a module IS the directory).
 fn locatein(dir: *u8, dirlen: u64,
     pathform: *u8, pflen: u64, isdir: *i32) *u8 = {
-	let buf: []u8 = alloc([], PATH_MAX)!;
+	let buf: []u8 = alloc([], (os.PATH_MAX: u64))!;
 	let off: u64 = 0u64;
 	let i: u64 = 0u64;
 	for (i < dirlen) { buf[off + i] = dir[i]; i += 1u64; };
@@ -2985,7 +2986,7 @@ fn locatein(dir: *u8, dirlen: u64,
 		return buf.ptr;
 	};
 
-	let buf2: []u8 = alloc([], PATH_MAX)!;
+	let buf2: []u8 = alloc([], (os.PATH_MAX: u64))!;
 	off = 0u64;
 	i = 0u64;
 	for (i < dirlen) { buf2[off + i] = dir[i]; i += 1u64; };
@@ -3430,8 +3431,8 @@ fn makestem(stem: *u8, src: *u8) void = {
 
 // Append a literal suffix to `stem` (which already lives in a buffer).
 fn appendlit(stem: *u8, suffix: str) *u8 = {
-	let buf: []u8 = alloc([], PATH_MAX)!;
-	buf.len = PATH_MAX: i32;
+	let buf: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	buf.len = os.PATH_MAX;
 	let off: u64 = cstrinto(buf.ptr, 0u64, stem);
 	off = strinto(buf.ptr, off, suffix);
 	cstrseal(buf.ptr, off);
@@ -3467,8 +3468,8 @@ fn buildone(selfdir: *u8, src: *u8, entryisdir: i32, out: *u8, incs: *u8, lf: *l
 	let l6: *u8 = joinpathlit(selfdir, "w6l_ww");
 
 	// Default lib search path: <selfdir>/../../lib
-	let dotdotlib: []u8 = alloc([], PATH_MAX)!;
-	dotdotlib.len = PATH_MAX: i32;
+	let dotdotlib: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	dotdotlib.len = os.PATH_MAX;
 	{
 		let off: u64 = cstrinto(dotdotlib.ptr, 0u64, selfdir);
 		off = strinto(dotdotlib.ptr, off, "/../../lib");
@@ -3481,8 +3482,8 @@ fn buildone(selfdir: *u8, src: *u8, entryisdir: i32, out: *u8, incs: *u8, lf: *l
 	// convention assumes you're running from the module dir; our
 	// wrappers don't cd, so dirname(src) stands in as the closest
 	// analog. Source-dir wins ties over the system path (cc -I.).
-	let srcd: []u8 = alloc([], PATH_MAX)!;
-	srcd.len = PATH_MAX: i32;
+	let srcd: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	srcd.len = os.PATH_MAX;
 	if (entryisdir != 0) {
 		let slen: u64 = cstrlen(src);
 		let k: u64 = 0u64;
@@ -3516,8 +3517,8 @@ fn buildone(selfdir: *u8, src: *u8, entryisdir: i32, out: *u8, incs: *u8, lf: *l
 	};
 
 	// Compose searchpath: srcd + ':' + incs + ':' + dotdotlib.
-	let searchpath: []u8 = alloc([], PATH_MAX * 3u64)!;
-	searchpath.len = (PATH_MAX * 3u64): i32;
+	let searchpath: []u8 = alloc([], (os.PATH_MAX: u64) * 3u64)!;
+	searchpath.len = ((os.PATH_MAX: u64) * 3u64): i32;
 	{
 		let off: u64 = cstrinto(searchpath.ptr, 0u64, srcd.ptr);
 		off = byteinto(searchpath.ptr, off, 58u8);	// ':'
@@ -3531,8 +3532,8 @@ fn buildone(selfdir: *u8, src: *u8, entryisdir: i32, out: *u8, incs: *u8, lf: *l
 
 	// Stem for .s/.o/.combined.ww side files. Dir entry: <dir>/<base>;
 	// file entry: src stripped of .ww.
-	let stem: []u8 = alloc([], PATH_MAX)!;
-	stem.len = PATH_MAX: i32;
+	let stem: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	stem.len = os.PATH_MAX;
 	if (entryisdir != 0) {
 		let dlen: u64 = cstrlen(srcd.ptr);
 		let bo: u64 = basenameoff(srcd.ptr, dlen);
@@ -3549,8 +3550,8 @@ fn buildone(selfdir: *u8, src: *u8, entryisdir: i32, out: *u8, incs: *u8, lf: *l
 	let combined: *u8 = appendlit(stem.ptr, ".combined.ww");
 
 	// libwwrt.a path: <selfdir>/../lib/libwwrt.a
-	let libwwrt: []u8 = alloc([], PATH_MAX)!;
-	libwwrt.len = PATH_MAX: i32;
+	let libwwrt: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	libwwrt.len = os.PATH_MAX;
 	{
 		let off: u64 = cstrinto(libwwrt.ptr, 0u64, selfdir);
 		off = strinto(libwwrt.ptr, off, "/../lib/libwwrt.a");
@@ -3701,7 +3702,7 @@ fn arenadupcstr(src: *u8, plen: u64) *u8 = {
 // buildsearchpath — compose the colon-separated lookup path used by
 // resolvemodule's case (4). Order: "." : <incs> : <selfdir>/../../lib
 fn buildsearchpath(selfdir: *u8, incs: *u8) *u8 = {
-	let buf: []u8 = alloc([], PATH_MAX * 2u64)!;
+	let buf: []u8 = alloc([], (os.PATH_MAX: u64) * 2u64)!;
 	let off: u64 = 0u64;
 	buf[off] = 46u8; off += 1u64;	// '.'
 	if (incs != nil) {
@@ -3776,8 +3777,8 @@ fn defaultoutpath(src: *u8) *u8 = {
 		if (src[i] == 47u8) { start = i + 1u64; };	// '/'
 		i += 1u64;
 	};
-	let out: []u8 = alloc([], PATH_MAX)!;
-	out.len = PATH_MAX: i32;
+	let out: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	out.len = os.PATH_MAX;
 	let off: u64 = 0u64;
 	let j: u64 = start;
 	for (j < n) {
@@ -3801,8 +3802,8 @@ fn defaultoutpath(src: *u8) *u8 = {
 
 fn dobuild(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 	let src: *u8 = nil;
-	let incs: []u8 = alloc([], PATH_MAX * 2u64)!;
-	incs.len = (PATH_MAX * 2u64): i32;
+	let incs: []u8 = alloc([], (os.PATH_MAX: u64) * 2u64)!;
+	incs.len = ((os.PATH_MAX: u64) * 2u64): i32;
 	let incoff: u64 = 0u64;
 	cstrseal(incs.ptr, 0u64);
 
@@ -3901,8 +3902,8 @@ fn dobuild(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 			rlen -= 1u64;
 		};
 		let bo: u64 = basenameoff(resolved, rlen);
-		let outbuf: []u8 = alloc([], PATH_MAX)!;
-		outbuf.len = PATH_MAX: i32;
+		let outbuf: []u8 = alloc([], (os.PATH_MAX: u64))!;
+		outbuf.len = os.PATH_MAX;
 		out = outbuf.ptr;
 		let i: u64 = bo;
 		let off: u64 = 0u64;
@@ -3952,8 +3953,8 @@ fn makeruntmp(buf: *u8) void = {
 fn dorun(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 	let src: *u8 = nil;
 	let passstart: i32 = -1;	// first argv idx to pass through to program
-	let incs: []u8 = alloc([], PATH_MAX * 2u64)!;
-	incs.len = (PATH_MAX * 2u64): i32;
+	let incs: []u8 = alloc([], (os.PATH_MAX: u64) * 2u64)!;
+	incs.len = ((os.PATH_MAX: u64) * 2u64): i32;
 	let incoff: u64 = 0u64;
 	cstrseal(incs.ptr, 0u64);
 
@@ -4052,8 +4053,8 @@ fn dorun(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 		return 1;
 	};
 
-	let tmp: []u8 = alloc([], PATH_MAX)!;
-	tmp.len = PATH_MAX: i32;
+	let tmp: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	tmp.len = os.PATH_MAX;
 	makeruntmp(tmp.ptr);
 	let lf: lflags;
 	lf.libdirs = libdirs.ptr;
@@ -4091,8 +4092,8 @@ fn dorun(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 //                report ok/FAIL per file, return 0 iff all pass.
 
 fn runsingletest(selfdir: *u8, src: *u8) i32 = {
-	let tmp: []u8 = alloc([], PATH_MAX)!;
-	tmp.len = PATH_MAX: i32;
+	let tmp: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	tmp.len = os.PATH_MAX;
 	makeruntmp(tmp.ptr);
 	if (buildone(selfdir, src, 0, tmp.ptr, "\0".ptr, nil) != 0) {
 		os.remove(pathstr(tmp.ptr));
@@ -4133,8 +4134,8 @@ fn rundirtests(selfdir: *u8, dir: *u8) i32 = {
 			if (cstrendswithlit(name, "_test.ww")) {
 				let nlen: u64 = cstrlen(name);
 				// path = <dir>/<name>
-				let path: []u8 = alloc([], PATH_MAX)!;
-				path.len = PATH_MAX: i32;
+				let path: []u8 = alloc([], (os.PATH_MAX: u64))!;
+				path.len = os.PATH_MAX;
 				let poff: u64 = cstrinto(path.ptr, 0u64, dir);
 				path[poff] = 47u8; poff += 1u64;
 				let i: u64 = 0u64;
@@ -4142,12 +4143,12 @@ fn rundirtests(selfdir: *u8, dir: *u8) i32 = {
 				poff += nlen;
 				cstrseal(path.ptr, poff);
 				// incs = <dir> so test files can `use ` siblings
-				let tincs: []u8 = alloc([], PATH_MAX)!;
-				tincs.len = PATH_MAX: i32;
+				let tincs: []u8 = alloc([], (os.PATH_MAX: u64))!;
+				tincs.len = os.PATH_MAX;
 				let ic: u64 = cstrinto(tincs.ptr, 0u64, dir);
 				cstrseal(tincs.ptr, ic);
-				let tmp: []u8 = alloc([], PATH_MAX)!;
-				tmp.len = PATH_MAX: i32;
+				let tmp: []u8 = alloc([], (os.PATH_MAX: u64))!;
+				tmp.len = os.PATH_MAX;
 				makeruntmp(tmp.ptr);
 				let bres: i32 = buildone(selfdir, path.ptr, 0, tmp.ptr, tincs.ptr, nil);
 				if (bres != 0) {
@@ -4213,9 +4214,9 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	};
 
 	// selfdir = dirname(argv[0])
-	let selfdir: []u8 = alloc([], PATH_MAX)!;
-	selfdir.len = PATH_MAX: i32;
-	selfdirinto(selfdir.ptr, PATH_MAX, argv[0]);
+	let selfdir: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	selfdir.len = os.PATH_MAX;
+	selfdirinto(selfdir.ptr, (os.PATH_MAX: u64), argv[0]);
 
 	if (argc < 2) {
 		writeusage(2);
diff --git a/selfhost/cmd/ww/main.ww b/selfhost/cmd/ww/main.ww
index f9805843..c1404241 100644
--- a/selfhost/cmd/ww/main.ww
+++ b/selfhost/cmd/ww/main.ww
@@ -18,8 +18,9 @@ import rt;
 import strings;
 
 // All path/string scratch buffers go on the runtime page allocator.
-// One page is plenty for any path we build.
-def PATH_MAX:    u64 = 4096u64;
+// One page is plenty for any path we build. PATH_MAX lives in lib/os
+// (os.PATH_MAX: i32 = 4096) — the duplicate u64 def was dropped to close
+// the cgen #127 mod-mangle attribution bug consumer per rule-7.
 def CMD_MAX:     u64 = 8192u64;
 
 // ---- C-string helpers --------------------------------------------------
@@ -139,8 +140,8 @@ fn selfdirinto(dst: *u8, dstsz: u64, argv0: *u8) void = {
 
 // Build "$dir/$name" (NUL-terminated) into a fresh page-sized buffer.
 fn joinpath(dir: *u8, name: *u8) *u8 = {
-	let buf: []u8 = alloc([], PATH_MAX)!;
-	buf.len = PATH_MAX: i32;
+	let buf: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	buf.len = os.PATH_MAX;
 	let off: u64 = cstrinto(buf.ptr, 0u64, dir);
 	off = byteinto(buf.ptr, off, 47u8);
 	off = cstrinto(buf.ptr, off, name);
@@ -150,8 +151,8 @@ fn joinpath(dir: *u8, name: *u8) *u8 = {
 
 // Same, but the second component is a ww `str` literal.
 fn joinpathlit(dir: *u8, name: str) *u8 = {
-	let buf: []u8 = alloc([], PATH_MAX)!;
-	buf.len = PATH_MAX: i32;
+	let buf: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	buf.len = os.PATH_MAX;
 	let off: u64 = cstrinto(buf.ptr, 0u64, dir);
 	off = byteinto(buf.ptr, off, 47u8);
 	off = strinto(buf.ptr, off, name);
@@ -254,7 +255,7 @@ fn importpathform(name: *u8, namelen: u64) *u8 = {
 // `foo/foo.ha` fallback; a module IS the directory).
 fn locatein(dir: *u8, dirlen: u64,
     pathform: *u8, pflen: u64, isdir: *i32) *u8 = {
-	let buf: []u8 = alloc([], PATH_MAX)!;
+	let buf: []u8 = alloc([], (os.PATH_MAX: u64))!;
 	let off: u64 = 0u64;
 	let i: u64 = 0u64;
 	for (i < dirlen) { buf[off + i] = dir[i]; i += 1u64; };
@@ -279,7 +280,7 @@ fn locatein(dir: *u8, dirlen: u64,
 		return buf.ptr;
 	};
 
-	let buf2: []u8 = alloc([], PATH_MAX)!;
+	let buf2: []u8 = alloc([], (os.PATH_MAX: u64))!;
 	off = 0u64;
 	i = 0u64;
 	for (i < dirlen) { buf2[off + i] = dir[i]; i += 1u64; };
@@ -724,8 +725,8 @@ fn makestem(stem: *u8, src: *u8) void = {
 
 // Append a literal suffix to `stem` (which already lives in a buffer).
 fn appendlit(stem: *u8, suffix: str) *u8 = {
-	let buf: []u8 = alloc([], PATH_MAX)!;
-	buf.len = PATH_MAX: i32;
+	let buf: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	buf.len = os.PATH_MAX;
 	let off: u64 = cstrinto(buf.ptr, 0u64, stem);
 	off = strinto(buf.ptr, off, suffix);
 	cstrseal(buf.ptr, off);
@@ -761,8 +762,8 @@ fn buildone(selfdir: *u8, src: *u8, entryisdir: i32, out: *u8, incs: *u8, lf: *l
 	let l6: *u8 = joinpathlit(selfdir, "w6l_ww");
 
 	// Default lib search path: <selfdir>/../../lib
-	let dotdotlib: []u8 = alloc([], PATH_MAX)!;
-	dotdotlib.len = PATH_MAX: i32;
+	let dotdotlib: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	dotdotlib.len = os.PATH_MAX;
 	{
 		let off: u64 = cstrinto(dotdotlib.ptr, 0u64, selfdir);
 		off = strinto(dotdotlib.ptr, off, "/../../lib");
@@ -775,8 +776,8 @@ fn buildone(selfdir: *u8, src: *u8, entryisdir: i32, out: *u8, incs: *u8, lf: *l
 	// convention assumes you're running from the module dir; our
 	// wrappers don't cd, so dirname(src) stands in as the closest
 	// analog. Source-dir wins ties over the system path (cc -I.).
-	let srcd: []u8 = alloc([], PATH_MAX)!;
-	srcd.len = PATH_MAX: i32;
+	let srcd: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	srcd.len = os.PATH_MAX;
 	if (entryisdir != 0) {
 		let slen: u64 = cstrlen(src);
 		let k: u64 = 0u64;
@@ -810,8 +811,8 @@ fn buildone(selfdir: *u8, src: *u8, entryisdir: i32, out: *u8, incs: *u8, lf: *l
 	};
 
 	// Compose searchpath: srcd + ':' + incs + ':' + dotdotlib.
-	let searchpath: []u8 = alloc([], PATH_MAX * 3u64)!;
-	searchpath.len = (PATH_MAX * 3u64): i32;
+	let searchpath: []u8 = alloc([], (os.PATH_MAX: u64) * 3u64)!;
+	searchpath.len = ((os.PATH_MAX: u64) * 3u64): i32;
 	{
 		let off: u64 = cstrinto(searchpath.ptr, 0u64, srcd.ptr);
 		off = byteinto(searchpath.ptr, off, 58u8);	// ':'
@@ -825,8 +826,8 @@ fn buildone(selfdir: *u8, src: *u8, entryisdir: i32, out: *u8, incs: *u8, lf: *l
 
 	// Stem for .s/.o/.combined.ww side files. Dir entry: <dir>/<base>;
 	// file entry: src stripped of .ww.
-	let stem: []u8 = alloc([], PATH_MAX)!;
-	stem.len = PATH_MAX: i32;
+	let stem: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	stem.len = os.PATH_MAX;
 	if (entryisdir != 0) {
 		let dlen: u64 = cstrlen(srcd.ptr);
 		let bo: u64 = basenameoff(srcd.ptr, dlen);
@@ -843,8 +844,8 @@ fn buildone(selfdir: *u8, src: *u8, entryisdir: i32, out: *u8, incs: *u8, lf: *l
 	let combined: *u8 = appendlit(stem.ptr, ".combined.ww");
 
 	// libwwrt.a path: <selfdir>/../lib/libwwrt.a
-	let libwwrt: []u8 = alloc([], PATH_MAX)!;
-	libwwrt.len = PATH_MAX: i32;
+	let libwwrt: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	libwwrt.len = os.PATH_MAX;
 	{
 		let off: u64 = cstrinto(libwwrt.ptr, 0u64, selfdir);
 		off = strinto(libwwrt.ptr, off, "/../lib/libwwrt.a");
@@ -995,7 +996,7 @@ fn arenadupcstr(src: *u8, plen: u64) *u8 = {
 // buildsearchpath — compose the colon-separated lookup path used by
 // resolvemodule's case (4). Order: "." : <incs> : <selfdir>/../../lib
 fn buildsearchpath(selfdir: *u8, incs: *u8) *u8 = {
-	let buf: []u8 = alloc([], PATH_MAX * 2u64)!;
+	let buf: []u8 = alloc([], (os.PATH_MAX: u64) * 2u64)!;
 	let off: u64 = 0u64;
 	buf[off] = 46u8; off += 1u64;	// '.'
 	if (incs != nil) {
@@ -1070,8 +1071,8 @@ fn defaultoutpath(src: *u8) *u8 = {
 		if (src[i] == 47u8) { start = i + 1u64; };	// '/'
 		i += 1u64;
 	};
-	let out: []u8 = alloc([], PATH_MAX)!;
-	out.len = PATH_MAX: i32;
+	let out: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	out.len = os.PATH_MAX;
 	let off: u64 = 0u64;
 	let j: u64 = start;
 	for (j < n) {
@@ -1095,8 +1096,8 @@ fn defaultoutpath(src: *u8) *u8 = {
 
 fn dobuild(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 	let src: *u8 = nil;
-	let incs: []u8 = alloc([], PATH_MAX * 2u64)!;
-	incs.len = (PATH_MAX * 2u64): i32;
+	let incs: []u8 = alloc([], (os.PATH_MAX: u64) * 2u64)!;
+	incs.len = ((os.PATH_MAX: u64) * 2u64): i32;
 	let incoff: u64 = 0u64;
 	cstrseal(incs.ptr, 0u64);
 
@@ -1195,8 +1196,8 @@ fn dobuild(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 			rlen -= 1u64;
 		};
 		let bo: u64 = basenameoff(resolved, rlen);
-		let outbuf: []u8 = alloc([], PATH_MAX)!;
-		outbuf.len = PATH_MAX: i32;
+		let outbuf: []u8 = alloc([], (os.PATH_MAX: u64))!;
+		outbuf.len = os.PATH_MAX;
 		out = outbuf.ptr;
 		let i: u64 = bo;
 		let off: u64 = 0u64;
@@ -1246,8 +1247,8 @@ fn makeruntmp(buf: *u8) void = {
 fn dorun(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 	let src: *u8 = nil;
 	let passstart: i32 = -1;	// first argv idx to pass through to program
-	let incs: []u8 = alloc([], PATH_MAX * 2u64)!;
-	incs.len = (PATH_MAX * 2u64): i32;
+	let incs: []u8 = alloc([], (os.PATH_MAX: u64) * 2u64)!;
+	incs.len = ((os.PATH_MAX: u64) * 2u64): i32;
 	let incoff: u64 = 0u64;
 	cstrseal(incs.ptr, 0u64);
 
@@ -1346,8 +1347,8 @@ fn dorun(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 		return 1;
 	};
 
-	let tmp: []u8 = alloc([], PATH_MAX)!;
-	tmp.len = PATH_MAX: i32;
+	let tmp: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	tmp.len = os.PATH_MAX;
 	makeruntmp(tmp.ptr);
 	let lf: lflags;
 	lf.libdirs = libdirs.ptr;
@@ -1385,8 +1386,8 @@ fn dorun(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 //                report ok/FAIL per file, return 0 iff all pass.
 
 fn runsingletest(selfdir: *u8, src: *u8) i32 = {
-	let tmp: []u8 = alloc([], PATH_MAX)!;
-	tmp.len = PATH_MAX: i32;
+	let tmp: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	tmp.len = os.PATH_MAX;
 	makeruntmp(tmp.ptr);
 	if (buildone(selfdir, src, 0, tmp.ptr, "\0".ptr, nil) != 0) {
 		os.remove(pathstr(tmp.ptr));
@@ -1427,8 +1428,8 @@ fn rundirtests(selfdir: *u8, dir: *u8) i32 = {
 			if (cstrendswithlit(name, "_test.ww")) {
 				let nlen: u64 = cstrlen(name);
 				// path = <dir>/<name>
-				let path: []u8 = alloc([], PATH_MAX)!;
-				path.len = PATH_MAX: i32;
+				let path: []u8 = alloc([], (os.PATH_MAX: u64))!;
+				path.len = os.PATH_MAX;
 				let poff: u64 = cstrinto(path.ptr, 0u64, dir);
 				path[poff] = 47u8; poff += 1u64;
 				let i: u64 = 0u64;
@@ -1436,12 +1437,12 @@ fn rundirtests(selfdir: *u8, dir: *u8) i32 = {
 				poff += nlen;
 				cstrseal(path.ptr, poff);
 				// incs = <dir> so test files can `use ` siblings
-				let tincs: []u8 = alloc([], PATH_MAX)!;
-				tincs.len = PATH_MAX: i32;
+				let tincs: []u8 = alloc([], (os.PATH_MAX: u64))!;
+				tincs.len = os.PATH_MAX;
 				let ic: u64 = cstrinto(tincs.ptr, 0u64, dir);
 				cstrseal(tincs.ptr, ic);
-				let tmp: []u8 = alloc([], PATH_MAX)!;
-				tmp.len = PATH_MAX: i32;
+				let tmp: []u8 = alloc([], (os.PATH_MAX: u64))!;
+				tmp.len = os.PATH_MAX;
 				makeruntmp(tmp.ptr);
 				let bres: i32 = buildone(selfdir, path.ptr, 0, tmp.ptr, tincs.ptr, nil);
 				if (bres != 0) {
@@ -1507,9 +1508,9 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	};
 
 	// selfdir = dirname(argv[0])
-	let selfdir: []u8 = alloc([], PATH_MAX)!;
-	selfdir.len = PATH_MAX: i32;
-	selfdirinto(selfdir.ptr, PATH_MAX, argv[0]);
+	let selfdir: []u8 = alloc([], (os.PATH_MAX: u64))!;
+	selfdir.len = os.PATH_MAX;
+	selfdirinto(selfdir.ptr, (os.PATH_MAX: u64), argv[0]);
 
 	if (argc < 2) {
 		writeusage(2);