diff --git a/.nvimrc b/.nvimrc
index a325e7d..9378ea2 100644
--- a/.nvimrc
+++ b/.nvimrc
@@ -1,3 +1,3 @@
-let g:loaded_airline=1
-autocmd FileType hs let b:airline_disable_statusline = 1
-set statusline=%!StatusLSP()
+" let g:loaded_airline=1
+" autocmd FileType hs let b:airline_disable_statusline = 1
+" set statusline=%!StatusLSP()
diff --git a/Net/Tcp/Constants.chs b/Net/Tcp/Constants.chs
index 267ba97..5027f95 100644
--- a/Net/Tcp/Constants.chs
+++ b/Net/Tcp/Constants.chs
@@ -15,6 +15,7 @@ module Net.Tcp.Constants
 where
 
 import Data.Bits ()
+import Data.Word (Word8, Word32)
 
 -- copy from include/net/tcp_states since it's not part of the user API
 #include <tcp_states.h>
@@ -26,4 +27,39 @@ import Data.Bits ()
 -- http://www.yonch.com/tech/linux-tcp-congestion-control-internals
 #include <linux/tcp.h>
 
+
 {#enum TCP_CA_Open as TcpCAState {underscoreToCase} deriving (Eq, Show)#}
+
+-- GenBind.evalCCast: Casts are implemented only for integral constants
+-- {#enum define TcpFlag {TCP_FLAG_SYN as TcpFlagSyn} deriving (Eq, Show)#}
+
+data TcpFlag = TcpFlagSyn | TcpFlagFin | TcpFlagAck
+
+-- {#const TCP_FLAG_SYN#}
+tcpFlagSynVal :: Word32
+tcpFlagSynVal = 2
+
+tcpFlagFinVal :: Word32
+tcpFlagFinVal = 1
+
+tcpFlagAckVal :: Word32
+tcpFlagAckVal = 8
+-- tcpFlagAck :: Word8
+-- tcpFlagAck = {#const TCP_FLAG_ACK #}
+
+
+-- TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),
+-- TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000),
+-- TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000),
+-- TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000),
+-- TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000),
+-- TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000),
+-- TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000),
+-- TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000),
+
+-- #define TH_FIN  0x0001
+-- #define TH_SYN  0x0002
+-- #define TH_RST  0x0004
+-- #define TH_PUSH 0x0008
+-- #define TH_ACK  0x0010
+