--- a/configure.ac	2026-10-19 16:56:21.189809724 +0200
+++ b/configure.ac	2026-10-19 16:56:21.205049887 +0200
@@ -268,6 +268,10 @@ int main() {
      *-*-mingw32* | *-*-cygwin*)
        bf_lsbf=1
      ;;
+     *-*-linux*)
+       # GCC allocates bitfields in byte order
+       test "x$ac_cv_c_bigendian" = xyes && bf_lsbf=0 || bf_lsbf=1
+     ;;
      *)
        AC_MSG_RESULT([unknown])
        AC_MSG_ERROR([value of bitfield test isn't known for $host