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-rw-r--r--sim/rx/configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/sim/rx/configure.ac b/sim/rx/configure.ac
index 16e64a5..344ab39 100644
--- a/sim/rx/configure.ac
+++ b/sim/rx/configure.ac
@@ -23,7 +23,7 @@ AC_CONFIG_MACRO_DIRS([../m4 ../.. ../../config])
SIM_AC_COMMON
-AC_CHECK_HEADERS(getopt.h)
+AC_CHECK_HEADERS_ONCE(getopt.h)
AC_ARG_ENABLE(cycle-accurate,
[AS_HELP_STRING([--disable-cycle-accurate],