--- ./configure	2021-07-15 02:25:34.000000000 +0530
+++ ./configure.mod	2021-07-25 17:40:51.831883002 +0530
@@ -227,8 +227,7 @@
     BUILD_EXTRA_LDFLAGS="$BUILD_EXTRA_LDFLAGS $(get_opt_value $OPT)"
     ;;
   *)
-      echo "unknown option $OPT"
-      exit 1
+      echo "WARNING: unknown option $OPT"
       ;;
   esac
   shift
@@ -487,7 +486,7 @@
 
 # Checking CC version...
 # Intel C++ Compilers (no autoselect, use CC=/some/binary ./configure)
-cc_vendor=
+cc_vendor=clang
 if test "$(basename $CC)" = "icc" || test "$(basename $CC)" = "ecc"; then
   start_check "$CC version"
   cc_vendor=intel