#0 0x00007f42aecf9f4d in FcConfigSubstituteWithPat () from /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 No symbol table info available. #1 0x00007f42aed0652d in FcFontRenderPrepare () from /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 No symbol table info available. #2 0x00007f42aed066cd in FcFontMatch () from /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 No symbol table info available. #3 0x00007f42aaec45c3 in ?? () No symbol table info available. #4 0x0000000000000000 in ?? () No symbol table info available.