diff --git a/cmake/common/buildspec_common.cmake b/cmake/common/buildspec_common.cmake
index cea80de..7110635 100644
--- a/cmake/common/buildspec_common.cmake
+++ b/cmake/common/buildspec_common.cmake
@@ -68,6 +68,77 @@ function(_check_deps_version version)
   return(PROPAGATE found CMAKE_PREFIX_PATH)
 endfunction()
 
+# _resolve_versioned_macos_sdk: return an SDK path whose *filename* carries the
+# version number, e.g. .../MacOSX15.5.sdk.
+#
+# Not upstream. OBS's own cmake/macos/compilerconfig.cmake reads the SDK
+# version by regex-matching "MacOSX<major>.<minor>.sdk" out of
+# CMAKE_OSX_SYSROOT, and hard-fails if that does not match:
+#
+#   string sub-command REGEX, mode MATCH needs at least 5 arguments
+#   Your macOS SDK version () is too low.
+#
+# With upstream's Xcode generator CMAKE_OSX_SYSROOT stays the literal string
+# "macosx" and Xcode resolves it late, so the regex never runs against a real
+# path. With Ninja -- which this project uses because CI has no Xcode -- CMake
+# resolves it eagerly to whatever `xcrun --show-sdk-path` returns, and on a
+# Command-Line-Tools-only install that is the UNVERSIONED symlink
+# /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk. Hence this: prefer a
+# versioned sibling if the toolchain ships one, and otherwise synthesise a
+# correctly-named symlink to the same SDK.
+function(_resolve_versioned_macos_sdk out_path)
+  set(${out_path} "" PARENT_SCOPE)
+
+  execute_process(
+    COMMAND xcrun --show-sdk-path
+    OUTPUT_VARIABLE _sdk
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    RESULT_VARIABLE _rc
+    ERROR_QUIET
+  )
+  if(NOT _rc EQUAL 0 OR NOT _sdk)
+    return()
+  endif()
+
+  # Already versioned: nothing to do.
+  get_filename_component(_sdk_name "${_sdk}" NAME)
+  if(_sdk_name MATCHES "^MacOSX[0-9]+\\.[0-9]+\\.sdk$")
+    set(${out_path} "${_sdk}" PARENT_SCOPE)
+    return()
+  endif()
+
+  execute_process(
+    COMMAND xcrun --show-sdk-version
+    OUTPUT_VARIABLE _sdk_version
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    RESULT_VARIABLE _rc
+    ERROR_QUIET
+  )
+  if(NOT _rc EQUAL 0 OR NOT _sdk_version MATCHES "^([0-9]+)\\.([0-9]+)")
+    return()
+  endif()
+  set(_short "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}")
+
+  # A versioned sibling next to the symlink is the common layout.
+  get_filename_component(_sdk_dir "${_sdk}" DIRECTORY)
+  if(EXISTS "${_sdk_dir}/MacOSX${_short}.sdk")
+    set(${out_path} "${_sdk_dir}/MacOSX${_short}.sdk" PARENT_SCOPE)
+    return()
+  endif()
+
+  # Otherwise make one, inside our own dependency directory.
+  set(_link_dir "${dependencies_dir}/sdk")
+  file(MAKE_DIRECTORY "${_link_dir}")
+  set(_link "${_link_dir}/MacOSX${_short}.sdk")
+  if(NOT EXISTS "${_link}")
+    file(CREATE_LINK "${_sdk}" "${_link}" SYMBOLIC)
+  endif()
+  if(EXISTS "${_link}")
+    message(STATUS "Using synthesised versioned macOS SDK path: ${_link}")
+    set(${out_path} "${_link}" PARENT_SCOPE)
+  endif()
+endfunction()
+
 # _setup_obs_studio: Create obs-studio build project, then build libobs and obs-frontend-api
 function(_setup_obs_studio)
   if(NOT libobs_DIR)
@@ -108,6 +179,10 @@ function(_setup_obs_studio)
     if(CMAKE_OSX_DEPLOYMENT_TARGET)
       list(APPEND _cmake_extra "-DCMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET}")
     endif()
+    _resolve_versioned_macos_sdk(_sdk_path)
+    if(_sdk_path)
+      list(APPEND _cmake_extra "-DCMAKE_OSX_SYSROOT=${_sdk_path}")
+    endif()
   endif()
 
   message(STATUS "Configure ${label} (${arch})")
diff --git a/obs-adapter/src/plugin-main.cpp b/obs-adapter/src/plugin-main.cpp
index 3bdc14d..3b0876e 100644
--- a/obs-adapter/src/plugin-main.cpp
+++ b/obs-adapter/src/plugin-main.cpp
@@ -237,6 +237,11 @@ void workerLoop(CameraSource *self)
         }
 
         const bool config_changed = generation != connected_generation;
+        if (config_changed) {
+            // A settings change is an operator action: try again immediately,
+            // whatever the previous attempt's backoff had grown to.
+            backoff_ms = kBackoffStartMs;
+        }
         const bool needs_connect =
             !connected || config_changed ||
             (self->session && (self->session->state() == SessionState::Failed ||
@@ -253,7 +258,11 @@ void workerLoop(CameraSource *self)
             if (!config.is_valid() || camera.empty()) {
                 self->setStatus("not configured -- set the server URL, room, read key and camera");
                 connected_generation = generation;
-                backoff_ms = kBackoffStartMs;
+                // Back off like any other unsuccessful attempt, so an
+                // unconfigured source is not a once-a-second no-op forever.
+                // Filling the settings in bumps the generation and wakes this
+                // thread immediately, so the backoff costs no responsiveness.
+                backoff_ms = backoff_ms * 2 < kBackoffMaxMs ? backoff_ms * 2 : kBackoffMaxMs;
             } else {
                 self->setStatus("connecting...");
                 const TokenResult token = self->api->requestToken(config);