travis: build ngtcp2 --with-gnutls

... since they disable it by default since a few days back.

Closes #6506
Fixes #6493

diff --git a/scripts/travis/before_script.sh b/scripts/travis/before_script.sh
index b22340211e52759761bb19a96f2dcd87ebf77aac..7ef9fb3a113ff6e5879f7b39010e25aabbe22a4a 100755 (executable)
--- a/scripts/travis/before_script.sh
+++ b/scripts/travis/before_script.sh
@@ -62,7 +62,10 @@ if [ "$NGTCP2" = yes ]; then
   git clone --depth 1 https://github.com/ngtcp2/ngtcp2
   cd ngtcp2
   autoreconf -i
-  ./configure PKG_CONFIG_PATH=$HOME/ngbuild/lib/pkgconfig LDFLAGS="-Wl,-rpath,$HOME/ngbuild/lib" --prefix=$HOME/ngbuild --enable-lib-only
+  if test -n "$GNUTLS"; then
+      WITHGNUTLS="--with-gnutls"
+  fi
+  ./configure PKG_CONFIG_PATH=$HOME/ngbuild/lib/pkgconfig LDFLAGS="-Wl,-rpath,$HOME/ngbuild/lib" --prefix=$HOME/ngbuild --enable-lib-only $WITHGNUTLS
   make
   make install
 fi