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AC_DEFUN([PDNS_WITH_LIBSSL], [
AC_MSG_CHECKING([whether we will be linking in OpenSSL libssl])
HAVE_LIBSSL=0
AC_ARG_WITH([libssl],
AS_HELP_STRING([--with-libssl],[use OpenSSL libssl @<:@default=auto@:>@]),
[with_libssl=$withval],
[with_libssl=auto],
)
AC_MSG_RESULT([$with_libssl])
AS_IF([test "x$with_libssl" != "xno"], [
AS_IF([test "x$with_libssl" = "xyes" -o "x$with_libssl" = "xauto"], [
PKG_CHECK_MODULES([LIBSSL], [libssl], [
[HAVE_LIBSSL=1]
AC_DEFINE([HAVE_LIBSSL], [1], [Define to 1 if you have OpenSSL libssl])
save_CFLAGS=$CFLAGS
save_LIBS=$LIBS
CFLAGS="$LIBSSL_CFLAGS $CFLAGS"
LIBS="$LIBSSL_LIBS -lcrypto $LIBS"
AC_CHECK_FUNCS([SSL_CTX_set_ciphersuites OCSP_basic_sign SSL_CTX_set_num_tickets SSL_CTX_set_keylog_callback SSL_CTX_get0_privatekey SSL_CTX_set_min_proto_version SSL_set_hostflags SSL_CTX_set_alpn_protos SSL_CTX_set_next_proto_select_cb SSL_get0_alpn_selected SSL_get0_next_proto_negotiated SSL_CTX_set_alpn_select_cb SSL_CTX_use_cert_and_key])
CFLAGS=$save_CFLAGS
LIBS=$save_LIBS
], [ : ])
])
])
AM_CONDITIONAL([HAVE_LIBSSL], [test "x$LIBSSL_LIBS" != "x"])
AS_IF([test "x$with_libssl" = "xyes"], [
AS_IF([test x"$LIBSSL_LIBS" = "x"], [
AC_MSG_ERROR([OpenSSL libssl requested but libraries were not found])
])
])
])
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