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--- ./configure.ac.orig	2017-05-16 10:32:11.000000000 +0200
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+++ ./configure.ac	2018-01-05 14:00:09.261806009 +0100
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@@ -512,7 +512,11 @@
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 have_libdbi=no
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-AC_ARG_ENABLE(libdbi,AS_HELP_STRING([--disable-libdbi],[do not build in support for libdbi]),[],[
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+AC_ARG_ENABLE(libdbi,AS_HELP_STRING([--disable-libdbi],[do not build in support for libdbi]),
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+[],
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+[enable_libdbi=yes])
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+
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+AS_IF([test "x$enable_libdbi" != xno], [
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     AC_CHECK_HEADER(dbi/dbi.h, [
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        AC_CHECK_LIB(dbi, dbi_initialize, [
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            AC_DEFINE(HAVE_LIBDBI,[1],[have got libdbi installed])
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@@ -526,7 +530,11 @@
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 have_librados=no
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-AC_ARG_ENABLE(librados,AS_HELP_STRING([--disable-librados],[do not build in support for librados]),[],[
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+AC_ARG_ENABLE(librados,AS_HELP_STRING([--disable-librados],[do not build in support for librados]),
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+[],
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+[enable_librados=yes])
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+
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+AS_IF([test "x$enable_librados" != xno], [
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     AC_CHECK_HEADER(rados/librados.h, [
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         AC_DEFINE(HAVE_LIBRADOS,[1],[have got librados installed])
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         LIBS="${LIBS} -lrados"
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@@ -538,7 +546,11 @@
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 have_libwrap=no
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-AC_ARG_ENABLE(libwrap, AS_HELP_STRING([--disable-libwrap], [do not build in support for libwrap (tcp wrapper)]),[],[
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+AC_ARG_ENABLE(libwrap, AS_HELP_STRING([--disable-libwrap], [do not build in support for libwrap (tcp wrapper)]),
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+[],
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+[enable_libwrap=yes])
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+
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+AS_IF([test "x$enable_libwrap" != xno], [
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     AC_CHECK_HEADER(tcpd.h,[
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         AC_CHECK_FUNCS(hosts_access, [
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             AC_DEFINE(HAVE_LIBWRAP,[1],[have got libwrap installed])
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@@ -554,7 +566,6 @@
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     ])
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 ])
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-
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 AM_CONDITIONAL(BUILD_LIBWRAP,[test $have_libwrap != no])
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 AM_CONDITIONAL(BUILD_RRDGRAPH,[test $enable_rrd_graph != no])