commit 005ffeaa8c27d29efd3037d52a26a948b71cbc0c
from: Alexander Barton <alex@barton.de>
date: Thu Sep 13 16:48:25 2012 UTC

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

commit - 5c8c6d3c70b5797ce2f10a180519f545df7a6b38
commit + 005ffeaa8c27d29efd3037d52a26a948b71cbc0c
blob - 468e927b4644088c82fae7b83ab3d84fbe10df9e
blob + 23b50cd7108a2db1cfd56c4c1d940b0b218839f6
--- configure.in
+++ 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])