diff --git a/lib/os/os.ww b/lib/os/os.ww
index 9cce6c6f..1aa65eb9 100644
--- a/lib/os/os.ww
+++ b/lib/os/os.ww
@@ -390,16 +390,12 @@ export fn getenv(name: str) (str | void) = {
 // but Hare's filestat doesn't expose btime either, so we stay on
 // the simpler 144B kernel struct.
 
-// at — flags for fstatat(2). Numeric values match <fcntl.h>.
-// Bundled as an enum because top-level `def` of a negative literal
-// (FDCWD = -100) doesn't get a DATA slot emitted by cstage cgen —
-// linker surfaces as "undefined reference". Tracked as task #24;
-// enum-member resolution sidesteps it cleanly.
-type at = enum i64 {
-	FDCWD            = -100,
-	SYMLINK_NOFOLLOW = 256,		// 0x100
-	EMPTY_PATH       = 4096,	// 0x1000
-};
+// fstatat(2) flag values. Linux constants from <linux/fcntl.h>.
+// Names mirror Hare's ref/hare/sys/+linux/types.ha:45-51 (capital-
+// AT_ prefix, top-level `def`s).
+export def AT_FDCWD:            i32 = -100;
+export def AT_SYMLINK_NOFOLLOW: i32 = 256;	// 0x100
+export def AT_EMPTY_PATH:       i32 = 4096;	// 0x1000
 
 // mode — file-mode bits. Mirrors Hare's fs::mode (ref/hare/fs/
 // types.ha:63). Permission bits are the standard Unix octal subset;
@@ -558,7 +554,7 @@ fn fillfilestat(out: *filestat, k: *kstat) void = {
 export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -568,8 +564,8 @@ export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 export fn lstat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64,
-	    at.SYMLINK_NOFOLLOW: i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64,
+	    AT_SYMLINK_NOFOLLOW: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -581,7 +577,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
 	    fd: i64, (&emptypath[0]): i64, (&k): i64,
-	    at.EMPTY_PATH: i64);
+	    AT_EMPTY_PATH: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -605,6 +601,6 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 export fn exists(path: *u8) bool = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	return r >= 0i64;
 };
diff --git a/selfhost/cmd/w6a/main.combined.ww b/selfhost/cmd/w6a/main.combined.ww
index 06a650ca..2c906dc6 100644
--- a/selfhost/cmd/w6a/main.combined.ww
+++ b/selfhost/cmd/w6a/main.combined.ww
@@ -391,16 +391,12 @@ export fn getenv(name: str) (str | void) = {
 // but Hare's filestat doesn't expose btime either, so we stay on
 // the simpler 144B kernel struct.
 
-// at — flags for fstatat(2). Numeric values match <fcntl.h>.
-// Bundled as an enum because top-level `def` of a negative literal
-// (FDCWD = -100) doesn't get a DATA slot emitted by cstage cgen —
-// linker surfaces as "undefined reference". Tracked as task #24;
-// enum-member resolution sidesteps it cleanly.
-type at = enum i64 {
-	FDCWD            = -100,
-	SYMLINK_NOFOLLOW = 256,		// 0x100
-	EMPTY_PATH       = 4096,	// 0x1000
-};
+// fstatat(2) flag values. Linux constants from <linux/fcntl.h>.
+// Names mirror Hare's ref/hare/sys/+linux/types.ha:45-51 (capital-
+// AT_ prefix, top-level `def`s).
+export def AT_FDCWD:            i32 = -100;
+export def AT_SYMLINK_NOFOLLOW: i32 = 256;	// 0x100
+export def AT_EMPTY_PATH:       i32 = 4096;	// 0x1000
 
 // mode — file-mode bits. Mirrors Hare's fs::mode (ref/hare/fs/
 // types.ha:63). Permission bits are the standard Unix octal subset;
@@ -559,7 +555,7 @@ fn fillfilestat(out: *filestat, k: *kstat) void = {
 export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -569,8 +565,8 @@ export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 export fn lstat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64,
-	    at.SYMLINK_NOFOLLOW: i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64,
+	    AT_SYMLINK_NOFOLLOW: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -582,7 +578,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
 	    fd: i64, (&emptypath[0]): i64, (&k): i64,
-	    at.EMPTY_PATH: i64);
+	    AT_EMPTY_PATH: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -606,7 +602,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 export fn exists(path: *u8) bool = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	return r >= 0i64;
 };
 
diff --git a/selfhost/cmd/w6c/main.combined.ww b/selfhost/cmd/w6c/main.combined.ww
index d5028b1e..058043c3 100644
--- a/selfhost/cmd/w6c/main.combined.ww
+++ b/selfhost/cmd/w6c/main.combined.ww
@@ -391,16 +391,12 @@ export fn getenv(name: str) (str | void) = {
 // but Hare's filestat doesn't expose btime either, so we stay on
 // the simpler 144B kernel struct.
 
-// at — flags for fstatat(2). Numeric values match <fcntl.h>.
-// Bundled as an enum because top-level `def` of a negative literal
-// (FDCWD = -100) doesn't get a DATA slot emitted by cstage cgen —
-// linker surfaces as "undefined reference". Tracked as task #24;
-// enum-member resolution sidesteps it cleanly.
-type at = enum i64 {
-	FDCWD            = -100,
-	SYMLINK_NOFOLLOW = 256,		// 0x100
-	EMPTY_PATH       = 4096,	// 0x1000
-};
+// fstatat(2) flag values. Linux constants from <linux/fcntl.h>.
+// Names mirror Hare's ref/hare/sys/+linux/types.ha:45-51 (capital-
+// AT_ prefix, top-level `def`s).
+export def AT_FDCWD:            i32 = -100;
+export def AT_SYMLINK_NOFOLLOW: i32 = 256;	// 0x100
+export def AT_EMPTY_PATH:       i32 = 4096;	// 0x1000
 
 // mode — file-mode bits. Mirrors Hare's fs::mode (ref/hare/fs/
 // types.ha:63). Permission bits are the standard Unix octal subset;
@@ -559,7 +555,7 @@ fn fillfilestat(out: *filestat, k: *kstat) void = {
 export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -569,8 +565,8 @@ export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 export fn lstat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64,
-	    at.SYMLINK_NOFOLLOW: i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64,
+	    AT_SYMLINK_NOFOLLOW: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -582,7 +578,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
 	    fd: i64, (&emptypath[0]): i64, (&k): i64,
-	    at.EMPTY_PATH: i64);
+	    AT_EMPTY_PATH: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -606,7 +602,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 export fn exists(path: *u8) bool = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	return r >= 0i64;
 };
 
diff --git a/selfhost/cmd/w6l/main.combined.ww b/selfhost/cmd/w6l/main.combined.ww
index 67d778d6..ddb65297 100644
--- a/selfhost/cmd/w6l/main.combined.ww
+++ b/selfhost/cmd/w6l/main.combined.ww
@@ -391,16 +391,12 @@ export fn getenv(name: str) (str | void) = {
 // but Hare's filestat doesn't expose btime either, so we stay on
 // the simpler 144B kernel struct.
 
-// at — flags for fstatat(2). Numeric values match <fcntl.h>.
-// Bundled as an enum because top-level `def` of a negative literal
-// (FDCWD = -100) doesn't get a DATA slot emitted by cstage cgen —
-// linker surfaces as "undefined reference". Tracked as task #24;
-// enum-member resolution sidesteps it cleanly.
-type at = enum i64 {
-	FDCWD            = -100,
-	SYMLINK_NOFOLLOW = 256,		// 0x100
-	EMPTY_PATH       = 4096,	// 0x1000
-};
+// fstatat(2) flag values. Linux constants from <linux/fcntl.h>.
+// Names mirror Hare's ref/hare/sys/+linux/types.ha:45-51 (capital-
+// AT_ prefix, top-level `def`s).
+export def AT_FDCWD:            i32 = -100;
+export def AT_SYMLINK_NOFOLLOW: i32 = 256;	// 0x100
+export def AT_EMPTY_PATH:       i32 = 4096;	// 0x1000
 
 // mode — file-mode bits. Mirrors Hare's fs::mode (ref/hare/fs/
 // types.ha:63). Permission bits are the standard Unix octal subset;
@@ -559,7 +555,7 @@ fn fillfilestat(out: *filestat, k: *kstat) void = {
 export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -569,8 +565,8 @@ export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 export fn lstat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64,
-	    at.SYMLINK_NOFOLLOW: i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64,
+	    AT_SYMLINK_NOFOLLOW: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -582,7 +578,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
 	    fd: i64, (&emptypath[0]): i64, (&k): i64,
-	    at.EMPTY_PATH: i64);
+	    AT_EMPTY_PATH: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -606,7 +602,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 export fn exists(path: *u8) bool = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	return r >= 0i64;
 };
 
diff --git a/selfhost/cmd/ww/main.combined.ww b/selfhost/cmd/ww/main.combined.ww
index 750ef7c7..303a3b6e 100644
--- a/selfhost/cmd/ww/main.combined.ww
+++ b/selfhost/cmd/ww/main.combined.ww
@@ -391,16 +391,12 @@ export fn getenv(name: str) (str | void) = {
 // but Hare's filestat doesn't expose btime either, so we stay on
 // the simpler 144B kernel struct.
 
-// at — flags for fstatat(2). Numeric values match <fcntl.h>.
-// Bundled as an enum because top-level `def` of a negative literal
-// (FDCWD = -100) doesn't get a DATA slot emitted by cstage cgen —
-// linker surfaces as "undefined reference". Tracked as task #24;
-// enum-member resolution sidesteps it cleanly.
-type at = enum i64 {
-	FDCWD            = -100,
-	SYMLINK_NOFOLLOW = 256,		// 0x100
-	EMPTY_PATH       = 4096,	// 0x1000
-};
+// fstatat(2) flag values. Linux constants from <linux/fcntl.h>.
+// Names mirror Hare's ref/hare/sys/+linux/types.ha:45-51 (capital-
+// AT_ prefix, top-level `def`s).
+export def AT_FDCWD:            i32 = -100;
+export def AT_SYMLINK_NOFOLLOW: i32 = 256;	// 0x100
+export def AT_EMPTY_PATH:       i32 = 4096;	// 0x1000
 
 // mode — file-mode bits. Mirrors Hare's fs::mode (ref/hare/fs/
 // types.ha:63). Permission bits are the standard Unix octal subset;
@@ -559,7 +555,7 @@ fn fillfilestat(out: *filestat, k: *kstat) void = {
 export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -569,8 +565,8 @@ export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 export fn lstat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64,
-	    at.SYMLINK_NOFOLLOW: i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64,
+	    AT_SYMLINK_NOFOLLOW: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -582,7 +578,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
 	    fd: i64, (&emptypath[0]): i64, (&k): i64,
-	    at.EMPTY_PATH: i64);
+	    AT_EMPTY_PATH: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -606,7 +602,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 export fn exists(path: *u8) bool = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	return r >= 0i64;
 };
 
diff --git a/selfhost/cmd/wwdump/main.combined.ww b/selfhost/cmd/wwdump/main.combined.ww
index 60fb7012..1549bbc7 100644
--- a/selfhost/cmd/wwdump/main.combined.ww
+++ b/selfhost/cmd/wwdump/main.combined.ww
@@ -391,16 +391,12 @@ export fn getenv(name: str) (str | void) = {
 // but Hare's filestat doesn't expose btime either, so we stay on
 // the simpler 144B kernel struct.
 
-// at — flags for fstatat(2). Numeric values match <fcntl.h>.
-// Bundled as an enum because top-level `def` of a negative literal
-// (FDCWD = -100) doesn't get a DATA slot emitted by cstage cgen —
-// linker surfaces as "undefined reference". Tracked as task #24;
-// enum-member resolution sidesteps it cleanly.
-type at = enum i64 {
-	FDCWD            = -100,
-	SYMLINK_NOFOLLOW = 256,		// 0x100
-	EMPTY_PATH       = 4096,	// 0x1000
-};
+// fstatat(2) flag values. Linux constants from <linux/fcntl.h>.
+// Names mirror Hare's ref/hare/sys/+linux/types.ha:45-51 (capital-
+// AT_ prefix, top-level `def`s).
+export def AT_FDCWD:            i32 = -100;
+export def AT_SYMLINK_NOFOLLOW: i32 = 256;	// 0x100
+export def AT_EMPTY_PATH:       i32 = 4096;	// 0x1000
 
 // mode — file-mode bits. Mirrors Hare's fs::mode (ref/hare/fs/
 // types.ha:63). Permission bits are the standard Unix octal subset;
@@ -559,7 +555,7 @@ fn fillfilestat(out: *filestat, k: *kstat) void = {
 export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -569,8 +565,8 @@ export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 export fn lstat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64,
-	    at.SYMLINK_NOFOLLOW: i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64,
+	    AT_SYMLINK_NOFOLLOW: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -582,7 +578,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
 	    fd: i64, (&emptypath[0]): i64, (&k): i64,
-	    at.EMPTY_PATH: i64);
+	    AT_EMPTY_PATH: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -606,7 +602,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 export fn exists(path: *u8) bool = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	return r >= 0i64;
 };
 
diff --git a/selfhost/test/smoke.combined.ww b/selfhost/test/smoke.combined.ww
index 7a153dfe..73416fe7 100644
--- a/selfhost/test/smoke.combined.ww
+++ b/selfhost/test/smoke.combined.ww
@@ -391,16 +391,12 @@ export fn getenv(name: str) (str | void) = {
 // but Hare's filestat doesn't expose btime either, so we stay on
 // the simpler 144B kernel struct.
 
-// at — flags for fstatat(2). Numeric values match <fcntl.h>.
-// Bundled as an enum because top-level `def` of a negative literal
-// (FDCWD = -100) doesn't get a DATA slot emitted by cstage cgen —
-// linker surfaces as "undefined reference". Tracked as task #24;
-// enum-member resolution sidesteps it cleanly.
-type at = enum i64 {
-	FDCWD            = -100,
-	SYMLINK_NOFOLLOW = 256,		// 0x100
-	EMPTY_PATH       = 4096,	// 0x1000
-};
+// fstatat(2) flag values. Linux constants from <linux/fcntl.h>.
+// Names mirror Hare's ref/hare/sys/+linux/types.ha:45-51 (capital-
+// AT_ prefix, top-level `def`s).
+export def AT_FDCWD:            i32 = -100;
+export def AT_SYMLINK_NOFOLLOW: i32 = 256;	// 0x100
+export def AT_EMPTY_PATH:       i32 = 4096;	// 0x1000
 
 // mode — file-mode bits. Mirrors Hare's fs::mode (ref/hare/fs/
 // types.ha:63). Permission bits are the standard Unix octal subset;
@@ -559,7 +555,7 @@ fn fillfilestat(out: *filestat, k: *kstat) void = {
 export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -569,8 +565,8 @@ export fn stat(out: *filestat, path: *u8) (void | oserror) = {
 export fn lstat(out: *filestat, path: *u8) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64,
-	    at.SYMLINK_NOFOLLOW: i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64,
+	    AT_SYMLINK_NOFOLLOW: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -582,7 +578,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
 	    fd: i64, (&emptypath[0]): i64, (&k): i64,
-	    at.EMPTY_PATH: i64);
+	    AT_EMPTY_PATH: i64);
 	if (r < 0) { return r: oserror; };
 	fillfilestat(out, &k);
 };
@@ -606,7 +602,7 @@ export fn fstat(out: *filestat, fd: i32) (void | oserror) = {
 export fn exists(path: *u8) bool = {
 	let k: kstat;
 	let r: i64 = syscall4(nr.NEWFSTATAT,
-	    at.FDCWD: i64, path: i64, (&k): i64, 0i64);
+	    AT_FDCWD: i64, path: i64, (&k): i64, 0i64);
 	return r >= 0i64;
 };