--- a/CMakeLists.txt	2026-03-25 08:10:46.000000000 +0100
+++ b/CMakeLists.txt	2026-10-19 17:17:34.572743143 +0200
@@ -1719,8 +1719,11 @@ if(WARNINGS_FATAL)
   endif()
 endif()
 
+# only the x86 names are checked, others like alpha clash with identifiers
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(i[3456]86|x86|x64|x86_64|AMD64)$")
+  target_compile_definitions(mixxx-lib PUBLIC "${CMAKE_SYSTEM_PROCESSOR}")
+endif()
 target_compile_definitions(mixxx-lib PUBLIC
-  "${CMAKE_SYSTEM_PROCESSOR}"
   $<$<CONFIG:Debug>:MIXXX_BUILD_DEBUG>
   $<$<CONFIG:Debug>:MIXXX_DEBUG_ASSERTIONS_ENABLED>
   $<$<NOT:$<CONFIG:Debug>>:MIXXX_BUILD_RELEASE>