add text rendering

Author: jcupitt

libvips-ubuntu20.04/Dockerfile

@@ -29,6 +29,7 @@ RUN apt-get install -y \
 	libexif-dev \
 	liblcms2-dev \
 	libheif-dev \
+	libpango1.0-dev \
 	liborc-dev
 
 WORKDIR /usr/local/src
@@ -41,15 +42,16 @@ RUN mkdir libvips-${VIPS_BRANCH} \
         && cd libvips-${VIPS_BRANCH} \
         && wget ${VIPS_URL}/${VIPS_BRANCH} -O - | tar xfz - --strip-components 1
 
-# "--libdir lib" makes it put the library in /usr/local/lib
 # we don't need GOI
+# ldconfig forces a rebuild of the library cache
 RUN cd libvips-${VIPS_BRANCH} \
         && rm -rf build \
-        && meson build --libdir lib -Dintrospection=disabled \
+        && meson build -Dintrospection=disabled \
         && cd build \
         && ninja \
         && ninja test \
-        && ninja install
+        && ninja install \
+        && ldconfig 
 
 # pyvips .. handy for testing
 RUN pip3 install pyvips