From 3a08d2f162de86e2613392c78e75df3b3a19aaf8 Mon Sep 17 00:00:00 2001
From: Lukas Lalinsky <lukas@lalinsky.com>
Date: Fri, 14 Nov 2025 17:48:19 +0100
Subject: [PATCH 1/3] Define std.c.MADV for NetBSD

The `.netbsd` branch was completely missing. Validated against the
actual system headers.
---
 lib/std/c.zig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/std/c.zig b/lib/std/c.zig
index bfda9c31c9..57852d4830 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -1599,6 +1599,15 @@ pub const MADV = switch (native_os) {
         pub const SEQUENTIAL = 0x5;
         pub const RANDOM = 0x6;
     },
+    .netbsd => struct {
+        pub const NORMAL = 0;
+        pub const RANDOM = 1;
+        pub const SEQUENTIAL = 2;
+        pub const WILLNEED = 3;
+        pub const DONTNEED = 4;
+        pub const SPACEAVAIL = 5;
+        pub const FREE = 6;
+    },
     else => void,
 };
 pub const MCL = switch (native_os) {

From 6fc5923a545952ed66e74f1018b86d3294f5810d Mon Sep 17 00:00:00 2001
From: Lukas Lalinsky <lukas@lalinsky.com>
Date: Fri, 14 Nov 2025 18:01:57 +0100
Subject: [PATCH 2/3] Define std.c.MADV for openbsd

---
 lib/std/c.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/std/c.zig b/lib/std/c.zig
index 57852d4830..de7e573378 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -1599,7 +1599,7 @@ pub const MADV = switch (native_os) {
         pub const SEQUENTIAL = 0x5;
         pub const RANDOM = 0x6;
     },
-    .netbsd => struct {
+    .netbsd, .openbsd => struct {
         pub const NORMAL = 0;
         pub const RANDOM = 1;
         pub const SEQUENTIAL = 2;

From 6bdea35ce543b1112bc48ccc30ae62f094d1aa2b Mon Sep 17 00:00:00 2001
From: Lukas Lalinsky <lukas@lalinsky.com>
Date: Fri, 14 Nov 2025 18:02:53 +0100
Subject: [PATCH 3/3] Fix std.c.MSF.SYNC for freebsd, openbsd, dragonfly

---
 lib/std/c.zig | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/std/c.zig b/lib/std/c.zig
index de7e573378..090cace31e 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -1640,7 +1640,17 @@ pub const MSF = switch (native_os) {
         pub const DEACTIVATE = 0x8;
         pub const SYNC = 0x10;
     },
-    .openbsd, .haiku, .dragonfly, .netbsd, .illumos, .freebsd => struct {
+    .freebsd, .dragonfly => struct {
+        pub const SYNC = 0;
+        pub const ASYNC = 1;
+        pub const INVALIDATE = 2;
+    },
+    .openbsd => struct {
+        pub const ASYNC = 1;
+        pub const SYNC = 2;
+        pub const INVALIDATE = 4;
+    },
+    .haiku, .netbsd, .illumos => struct {
         pub const ASYNC = 1;
         pub const INVALIDATE = 2;
         pub const SYNC = 4;