3 files changed, 19 insertions, 7 deletions
diff --git a/compat/simple-ipc/ipc-shared.c b/compat/simple-ipc/ipc-shared.c
index 1edec81595..1b9d359ab6 100644
--- a/compat/simple-ipc/ipc-shared.c
+++ b/compat/simple-ipc/ipc-shared.c
@@ -4,7 +4,13 @@
 #include "pkt-line.h"
 #include "thread-utils.h"
 
-#ifdef SUPPORTS_SIMPLE_IPC
+#ifndef SUPPORTS_SIMPLE_IPC
+/*
+ * This source file should only be compiled when Simple IPC is supported.
+ * See the top-level Makefile.
+ */
+#error SUPPORTS_SIMPLE_IPC not defined
+#endif
 
 int ipc_server_run(const char *path, const struct ipc_server_opts *opts,
 		   ipc_server_application_cb *application_cb,
@@ -24,5 +30,3 @@ int ipc_server_run(const char *path, const struct ipc_server_opts *opts,
 
 	return ret;
 }
-
-#endif /* SUPPORTS_SIMPLE_IPC */
diff --git a/compat/simple-ipc/ipc-unix-socket.c b/compat/simple-ipc/ipc-unix-socket.c
index 38689b278d..1927e6ef4b 100644
--- a/compat/simple-ipc/ipc-unix-socket.c
+++ b/compat/simple-ipc/ipc-unix-socket.c
@@ -6,8 +6,12 @@
 #include "unix-socket.h"
 #include "unix-stream-server.h"
 
-#ifdef NO_UNIX_SOCKETS
-#error compat/simple-ipc/ipc-unix-socket.c requires Unix sockets
+#ifndef SUPPORTS_SIMPLE_IPC
+/*
+ * This source file should only be compiled when Simple IPC is supported.
+ * See the top-level Makefile.
+ */
+#error SUPPORTS_SIMPLE_IPC not defined
 #endif
 
 enum ipc_active_state ipc_get_active_state(const char *path)
diff --git a/compat/simple-ipc/ipc-win32.c b/compat/simple-ipc/ipc-win32.c
index 8f89c02037..8dc7bda087 100644
--- a/compat/simple-ipc/ipc-win32.c
+++ b/compat/simple-ipc/ipc-win32.c
@@ -4,8 +4,12 @@
 #include "pkt-line.h"
 #include "thread-utils.h"
 
-#ifndef GIT_WINDOWS_NATIVE
-#error This file can only be compiled on Windows
+#ifndef SUPPORTS_SIMPLE_IPC
+/*
+ * This source file should only be compiled when Simple IPC is supported.
+ * See the top-level Makefile.
+ */
+#error SUPPORTS_SIMPLE_IPC not defined
 #endif
 
 static int initialize_pipe_name(const char *path, wchar_t *wpath, size_t alloc)