diff --git a/core/sys/posix/fcntl.odin b/core/sys/posix/fcntl.odin
index bb2e6835bbc..d48e39d02b7 100644
--- a/core/sys/posix/fcntl.odin
+++ b/core/sys/posix/fcntl.odin
@@ -128,7 +128,7 @@ O_Flag_Bits :: enum c.int {
 	// RSYNC = O_RSYNC,
 
 	// Execute only.
-	EXEC      = log2(O_EXEC),
+	EXEC      = O_EXEC when ODIN_OS == .Linux else log2(O_EXEC),
 	// Reading and writing.
 	RDWR      = log2(O_RDWR),
 	// Writing only.
@@ -177,7 +177,7 @@ when ODIN_OS == .Darwin {
 	O_DIRECTORY :: 0x00100000
 	O_EXCL      :: 0x00000800
 	O_NOCTTY    :: 0x00020000
-	O_NOFOLLOW   :: 0x00000100
+	O_NOFOLLOW  :: 0x00000100
 	O_TRUNC     :: 0x00000400
 
 	_O_TTY_INIT :: 0
@@ -242,7 +242,7 @@ when ODIN_OS == .Darwin {
 	O_DIRECTORY :: 0x00020000
 	O_EXCL      :: 0x0800
 	O_NOCTTY    :: 0x8000
-	O_NOFOLLOW   :: 0x0100
+	O_NOFOLLOW  :: 0x0100
 	O_TRUNC     :: 0x0400
 
 	_O_TTY_INIT :: 0x00080000
@@ -307,7 +307,7 @@ when ODIN_OS == .Darwin {
 	O_DIRECTORY :: 0x0020000
 	O_EXCL      :: 0x0800
 	O_NOCTTY    :: 0x8000
-	O_NOFOLLOW   :: 0x0100
+	O_NOFOLLOW  :: 0x0100
 	O_TRUNC     :: 0x0400
 
 	_O_TTY_INIT :: 0
@@ -372,7 +372,7 @@ when ODIN_OS == .Darwin {
 	O_DIRECTORY :: 0x20000
 	O_EXCL      :: 0x0800
 	O_NOCTTY    :: 0x8000
-	O_NOFOLLOW   :: 0x0100
+	O_NOFOLLOW  :: 0x0100
 	O_TRUNC     :: 0x0400
 
 	_O_TTY_INIT :: 0
diff --git a/core/sys/posix/poll.odin b/core/sys/posix/poll.odin
index 7f23de2673d..3d403d6255f 100644
--- a/core/sys/posix/poll.odin
+++ b/core/sys/posix/poll.odin
@@ -27,9 +27,9 @@ foreign lib {
 nfds_t :: c.uint
 
 Poll_Error :: enum c.int {
-	EAGAIN = Errno.EAGAIN,
-	EINTR  = Errno.EINTR,
-	EINVAL = Errno.EINVAL,
+	EAGAIN = cast(c.int)Errno.EAGAIN,
+	EINTR  = cast(c.int)Errno.EINTR,
+	EINVAL = cast(c.int)Errno.EINVAL,
 }
 
 Poll_Event_Bits :: enum c.short {
diff --git a/core/sys/posix/sched.odin b/core/sys/posix/sched.odin
index 6623ba6e68b..3923257aa9f 100644
--- a/core/sys/posix/sched.odin
+++ b/core/sys/posix/sched.odin
@@ -94,7 +94,7 @@ when ODIN_OS == .Darwin {
 	SCHED_RR       :: 3
 	SCHED_OTHER    :: 2
 
-} else when ODIN_OS == .NetBSD {
+} else when ODIN_OS == .NetBSD || ODIN_OS == .Linux {
 
 	SCHED_OTHER    :: 0
 	SCHED_FIFO     :: 1
diff --git a/core/sys/posix/sys_select.odin b/core/sys/posix/sys_select.odin
index 3392e02bc06..c20636b2163 100644
--- a/core/sys/posix/sys_select.odin
+++ b/core/sys/posix/sys_select.odin
@@ -55,7 +55,7 @@ when ODIN_OS == .NetBSD {
 	LSELECT  :: "select"
 }
 
-when ODIN_OS == .Darwin || ODIN_OS == .FreeBSD || ODIN_OS == .NetBSD || ODIN_OS == .OpenBSD {
+when ODIN_OS == .Darwin || ODIN_OS == .FreeBSD || ODIN_OS == .NetBSD || ODIN_OS == .OpenBSD || ODIN_OS == .Linux {
 
 	suseconds_t :: distinct (c.int32_t when ODIN_OS == .Darwin || ODIN_OS == .NetBSD else c.long)