Romain

**g++ version:** g++ (Debian 6.3.0-18+deb9u1) 6.3.0 20170516 **pdf2json version:** 0.70 **chunck of the trace:** ``` ImgOutputDev.cc:833:66: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] glMetaVars->append(new HtmlMetaVar("generator", "pdf2json...