- [AC_DEFINE(HAVE_BZIP2, 1, [Define in BZIP2 is available]) have_bzip2=yes],
- [AC_MSG_ERROR([*** BZIP2 support requested but headers not found])])
+ [AC_DEFINE(HAVE_BZIP2, 1, [Define in BZIP2 is available])
+ have_bzip2=yes],
+ [AS_IF([test "x$have_bzip2" = xyes], [AC_MSG_ERROR([*** BZIP2 support requested but headers not found])])
+ ])