diff -aurN ftp/lftp.orig/Makefile ftp/lftp/Makefile
--- ftp/lftp.orig/Makefile	2018-08-21 12:25:31.034954000 +0200
+++ ftp/lftp/Makefile	2018-08-23 12:10:22.291004000 +0200
@@ -43,6 +43,7 @@
 OPENSSL_CONFIGURE_WITH=	openssl
 OPENSSL_USES=	ssl
 GNUTLS_CONFIGURE_WITH=	gnutls
+GNUTLS_CONFIGURE_ENV=	LIBS=-pthread
 GNUTLS_LIB_DEPENDS=	libgnutls.so:security/gnutls
 GNUTLS_USES=	pkgconfig