diff --git a/compiler-rt/cmake/builtin-config-ix.cmake b/compiler-rt/cmake/builtin-config-ix.cmake
--- a/compiler-rt/cmake/builtin-config-ix.cmake
+++ b/compiler-rt/cmake/builtin-config-ix.cmake
@@ -231,7 +231,7 @@
     ${ALL_BUILTIN_SUPPORTED_ARCH})
 endif()
 
-if (OS_NAME MATCHES "Linux" AND NOT LLVM_USE_SANITIZER)
+if (OS_NAME MATCHES "Linux|SerenityOS" AND NOT LLVM_USE_SANITIZER)
   set(COMPILER_RT_HAS_CRT TRUE)
 else()
   set(COMPILER_RT_HAS_CRT FALSE)
diff --git a/compiler-rt/cmake/crt-config-ix.cmake b/compiler-rt/cmake/crt-config-ix.cmake
--- a/compiler-rt/cmake/crt-config-ix.cmake
+++ b/compiler-rt/cmake/crt-config-ix.cmake
@@ -47,7 +47,7 @@
   message(STATUS "Supported architectures for crt: ${CRT_SUPPORTED_ARCH}")
 endif()
 
-if (CRT_SUPPORTED_ARCH AND OS_NAME MATCHES "Linux" AND NOT LLVM_USE_SANITIZER)
+if (CRT_SUPPORTED_ARCH AND OS_NAME MATCHES "Linux|SerenityOS" AND NOT LLVM_USE_SANITIZER)
   set(COMPILER_RT_HAS_CRT TRUE)
 else()
   set(COMPILER_RT_HAS_CRT FALSE)