diff --git a/arch/nt32/bits/socket.h b/arch/nt32/bits/socket.h
deleted file mode 100644
index 36febbc..0000000
--- a/arch/nt32/bits/socket.h
+++ /dev/null
@@ -1,17 +0,0 @@
-struct msghdr
-{
-	void *msg_name;
-	socklen_t msg_namelen;
-	struct iovec *msg_iov;
-	int msg_iovlen;
-	void *msg_control;
-	socklen_t msg_controllen;
-	int msg_flags;
-};
-
-struct cmsghdr
-{
-	socklen_t cmsg_len;
-	int cmsg_level;
-	int cmsg_type;
-};
diff --git a/arch/nt32/bits/socket.h.in b/arch/nt32/bits/socket.h.in
new file mode 100644
index 0000000..36febbc
--- /dev/null
+++ b/arch/nt32/bits/socket.h.in
@@ -0,0 +1,17 @@
+struct msghdr
+{
+	void *msg_name;
+	socklen_t msg_namelen;
+	struct iovec *msg_iov;
+	int msg_iovlen;
+	void *msg_control;
+	socklen_t msg_controllen;
+	int msg_flags;
+};
+
+struct cmsghdr
+{
+	socklen_t cmsg_len;
+	int cmsg_level;
+	int cmsg_type;
+};
diff --git a/arch/nt64/bits/socket.h b/arch/nt64/bits/socket.h
deleted file mode 100644
index eb81356..0000000
--- a/arch/nt64/bits/socket.h
+++ /dev/null
@@ -1,18 +0,0 @@
-struct msghdr
-{
-	void *msg_name;
-	socklen_t msg_namelen;
-	struct iovec *msg_iov;
-	int msg_iovlen, __pad1;
-	void *msg_control;
-	socklen_t msg_controllen, __pad2;
-	int msg_flags;
-};
-
-struct cmsghdr
-{
-	socklen_t cmsg_len;
-	int cmsg_level;
-	int cmsg_type;
-	int __pad1;
-};
diff --git a/arch/nt64/bits/socket.h.in b/arch/nt64/bits/socket.h.in
new file mode 100644
index 0000000..eb81356
--- /dev/null
+++ b/arch/nt64/bits/socket.h.in
@@ -0,0 +1,18 @@
+struct msghdr
+{
+	void *msg_name;
+	socklen_t msg_namelen;
+	struct iovec *msg_iov;
+	int msg_iovlen, __pad1;
+	void *msg_control;
+	socklen_t msg_controllen, __pad2;
+	int msg_flags;
+};
+
+struct cmsghdr
+{
+	socklen_t cmsg_len;
+	int cmsg_level;
+	int cmsg_type;
+	int __pad1;
+};
diff --git a/project/headers.mk b/project/headers.mk
index 77f7cf1..db8aab0 100644
--- a/project/headers.mk
+++ b/project/headers.mk
@@ -103,6 +103,11 @@ build/headers.tag:	$(ARCH_HEADERS)
 			touch $@
 
 headers.tag:		build/headers.tag $(ARCH_GEN_H)
+			grep 'struct msghdr {' $(SOURCE_DIR)/include/sys/socket.h \
+				|| cat $(PORT_DIR)/arch/$(ARCH)/bits/socket.h.in   \
+					> build/include/bits/socket.h               \
+				|| cat $(PORT_DIR)/arch/$(ARCH)/bits/socket.h        \
+					> build/include/bits/socket.h
 			grep -v '^@@@' build/include/bits/ioctl.h \
 				> build/include/bits/ioctl.h.tmp
 			grep 'struct winsize' $(SOURCE_DIR)/include/sys/ioctl.h \