AC_DEFINE(_REENTRANT, 1, [Define to enable reentrancy interfaces.])
AC_MSG_CHECKING([whether compiler builds 64bit binaries])
- AC_PREPROC_IFELSE([AC_LANG_PROGRAM([
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
#ifndef _LP64
# error "Compiler not in 64bit mode."
#endif