Index: platforms/unix/config/configure.ac
--- platforms/unix/config/configure.ac.orig
+++ platforms/unix/config/configure.ac
@@ -243,7 +243,6 @@ AC_FUNC_ALLOCA
 AC_GNU_OPT
 AC_GNU_INTERP
 AC_MODULE_LIB_PREFIX
-AC_64BIT_ARCH
 
 CFLAGS="$CFLAGS_32 $CFLAGS"
 
