docker: Work around autotools bug requiring gtkdocize unconditionally

diff --git a/docker/sigrok-mxe.Dockerfile b/docker/sigrok-mxe.Dockerfile
index 4ccd427ff4fe98f0cc1d8e4c8bb33aab335ac158..0baa7431d2afb5be3ca87c62fa4de4ccf7f332e0 100644 (file)
--- a/docker/sigrok-mxe.Dockerfile
+++ b/docker/sigrok-mxe.Dockerfile
@@ -30,6 +30,7 @@ RUN apt-get update \
                gettext \
                git \
                gperf \
+               gtk-doc-tools \
                intltool \
                libc6-dev-i386 \
                libgdk-pixbuf2.0-dev \