This proceedure is usually reserved for vintage advertising posters. The "glue" you mention is probably either rice starch or wheat starch paste.
The vintage advertising posters were printed on fairly fragile paper since there was no plan for them to last beyond their immediate marketing use. Mounting them to linen helps to stabalize them and using fully reversible paste for the mounting assures that they can receive further treatments as necessary. The poster were printed using lithography which incorporates oil based inks to make the image. A water based starch would not affect the pigments.
Your client needs to know a lot more about the appropriatness of the process for the application.
A company called Poster Conservation (in Boston, I think) does this kind of mounting all day long. They have the appropriate materials, tools and expertise. I would never attempt to do a mount such as this when their services are so readily available. I have talked with the folks there and they will sell supplies to the do-it-yourselfers.
Oh, and if memory serves, the print is not mounted directly to the linen. There is a thin rag paper that is first mounted to the linen, and the print is then mounted to his.
There are other fabric backing options available for non-preservation applications. Chartpack makes a product that is used in backing maps and charts so they can be rolled up and easily stored. It is heat activated and can be applied using a dry mount/ heat vaccuum press.