Files with font subsets are useless for use with tools like psfrag. Disabling subsetting and exporting the proper input strings would fix that, instead of requiring hard to maintain and use LaTeX sidecar files. See for example: http://old.nabble.com/Inkscape-eps-export-for-Latex-td25207812.html
*** This bug has been marked as a duplicate of bug 23551 ***
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