diff --git a/CMakeLists.txt b/CMakeLists.txt
index 48b1493b5..df87580de 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -75,6 +75,16 @@ check_c_source_compiles("
   "
   HAVE__DIV64
 )
+check_c_source_compiles("
+    typedef float vec __attribute__((ext_vector_type(4)));
+    int main()
+    {
+        vec a = (vec){0, 1, 2, 3};
+        return 0;
+    }
+  "
+  HAVE_EXT_VECTOR_TYPE
+)
 
 option(CMAKE_FIND_PACKAGE_PREFER_CONFIG
        "Lookup package config files before using find modules" ON)
diff --git a/src/m_vector.h b/src/m_vector.h
index 35373549d..74755f8b4 100644
--- a/src/m_vector.h
+++ b/src/m_vector.h
@@ -20,9 +20,10 @@
 
 #include <math.h>
 
+#include "config.h"
 #include "doomtype.h"
 
-#if defined(__has_attribute) && defined(__clang__) && __has_attribute(ext_vector_type)
+#if defined(HAVE_EXT_VECTOR_TYPE)
 typedef float vec __attribute__((ext_vector_type(3)));
 #else
 typedef struct
@@ -33,7 +34,7 @@ typedef struct
 } vec;
 #endif
 
-#if defined(__has_attribute) && defined(__clang__) && __has_attribute(ext_vector_type)
+#if defined(HAVE_EXT_VECTOR_TYPE)
 typedef float quat __attribute__((ext_vector_type(4)));
 #else
 typedef struct