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-rw-r--r--nix/nix-daemon/nix-daemon.cc17
1 files changed, 14 insertions, 3 deletions
diff --git a/nix/nix-daemon/nix-daemon.cc b/nix/nix-daemon/nix-daemon.cc
index 56137701a1..1163a249d1 100644
--- a/nix/nix-daemon/nix-daemon.cc
+++ b/nix/nix-daemon/nix-daemon.cc
@@ -1,3 +1,4 @@
+#include "config.h"
 #include "shared.hh"
 #include "local-store.hh"
 #include "util.hh"
@@ -580,8 +581,14 @@ static void performOp(bool trusted, unsigned int clientVersion,
             settings.set("build-max-silent-time", std::to_string(readInt(from)));
         }
 
-        if (GET_PROTOCOL_MINOR(clientVersion) >= 2)
+        if (GET_PROTOCOL_MINOR(clientVersion) >= 2) {
+#ifdef HAVE_DAEMON_OFFLOAD_HOOK
             settings.useBuildHook = readInt(from) != 0;
+#else
+	    readInt(from);			  // ignore the user's setting
+#endif
+	}
+
         if (GET_PROTOCOL_MINOR(clientVersion) >= 4) {
             settings.buildVerbosity = (Verbosity) readInt(from);
             logType = (LogType) readInt(from);
@@ -590,8 +597,12 @@ static void performOp(bool trusted, unsigned int clientVersion,
         if (GET_PROTOCOL_MINOR(clientVersion) >= 6
             && GET_PROTOCOL_MINOR(clientVersion) < 0x61)
             settings.set("build-cores", std::to_string(readInt(from)));
-        if (GET_PROTOCOL_MINOR(clientVersion) >= 10)
-            settings.set("build-use-substitutes", readInt(from) ? "true" : "false");
+        if (GET_PROTOCOL_MINOR(clientVersion) >= 10) {
+	    if (settings.useSubstitutes)
+		settings.set("build-use-substitutes", readInt(from) ? "true" : "false");
+	    else
+		readInt(from);			// substitutes remain disabled
+	}
         if (GET_PROTOCOL_MINOR(clientVersion) >= 12) {
             unsigned int n = readInt(from);
             for (unsigned int i = 0; i < n; i++) {