+unet_cv_enable_gnutls="no"
+unet_cv_enable_openssl="yes"
+
+AC_MSG_CHECKING([for GnuTLS])
+AC_ARG_ENABLE([gnutls],
+ [ --enable-gnutls Enables GnuTLS ssl backend.],
+ [unet_cv_enable_gnutls=$enable_gnutls],
+)
+AC_MSG_RESULT([$unet_cv_enable_gnutls])
+
+AC_MSG_CHECKING([for OpenSSL])
+AC_ARG_ENABLE([openssl],
+ [ --enable-openssl Enables OpenSSL ssl backend.],
+ [unet_cv_enable_openssl=$enable_openssl],
+)
+AC_MSG_RESULT([$unet_cv_enable_openssl])
+
+if test x"$unet_cv_enable_gnutls" = xyes; then
+ unet_cv_enable_gnutls="no";
+ AC_CHECK_LIB(gnutls, gnutls_init, [
+ AC_CHECK_HEADERS(gnutls/gnutls.h, [
+ unet_cv_enable_gnutls="yes";
+ ])
+ ])
+fi
+
+if test x"$unet_cv_enable_openssl" = xyes; then
+ unet_cv_enable_openssl="no";
+ AC_CHECK_LIB(ssl, SSL_read, [
+ AC_CHECK_LIB(crypto, X509_new, [
+ AC_CHECK_HEADERS(openssl/ssl.h openssl/err.h, [
+ unet_cv_enable_openssl="yes";
+ ])
+ ])
+ ])
+fi
+
+if test x"$unet_cv_enable_gnutls" = xyes; then
+ LIBS="$LIBS -lgnutls"
+ AC_DEFINE([HAVE_GNUTLS], 1, [Define if you are using GnuTLS])
+fi
+
+if test x"$unet_cv_enable_openssl" = xyes ; then
+ LIBS="$LIBS -lssl -lcrypto"
+ AC_DEFINE([HAVE_OPENSSL], 1, [Define if you are using OpenSSL])
+fi
+