+# Check for standards compliance mode
+AC_ARG_ENABLE(standards,
+ AS_HELP_STRING([--enable-standards], [Enable standards compliance mode]),
+ [enable_standards="$enableval"],
+ [enable_standards="no"])
+if test "x$enable_standards" = "xyes"
+then
+ AC_DEFINE(_ISOC99_SOURCE, 1, [Define to enforce ISO C99 compliance.])
+ AC_DEFINE(_POSIX_C_SOURCE, 200112L, [Define to enforce POSIX.1-2001 compliance.])
+ AC_DEFINE(_XOPEN_SOURCE, 600, [Define to enforce X/Open 6 (XSI) compliance.])
+ AC_DEFINE(_REENTRANT, 1, [Define to enable reentrancy interfaces.])
+fi
+AM_CONDITIONAL(BUILD_FEATURE_STANDARDS, test "x$enable_standards" = "xyes")
+