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commit 005ffeaa8c27d29efd3037d52a26a948b71cbc0c
Author: Alexander Barton 
Date:   Thu Sep 13 18:48:25 2012 +0200

    configure.in: use AC_CHECK_{FUNCS|HEADERS}_ONCE

diff --git a/configure.in b/configure.in

--- a/configure.in
+++ b/configure.in
@@ -113,7 +113,7 @@ AC_CHECK_HEADERS([ \
 	],,AC_MSG_ERROR([required C header missing!]))

 # Optional header files
-AC_CHECK_HEADERS([ \
+AC_CHECK_HEADERS_ONCE([ \
 	arpa/inet.h inttypes.h malloc.h netinet/ip.h stdbool.h stddef.h \
 	stdint.h varargs.h \
 	])
@@ -176,7 +176,7 @@ AC_CHECK_FUNCS([ \
 	AC_MSG_ERROR([required function missing!]))

 # Optional functions
-AC_CHECK_FUNCS([ \
+AC_CHECK_FUNCS_ONCE([ \
 	gai_strerror getaddrinfo getnameinfo inet_aton sigaction sigprocmask \
 	snprintf vsnprintf strdup strlcpy strlcat strtok_r waitpid])

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