Error during doxygen build

Hi there, 

I am new to doxygen, so please bear with me... During doxygen build, when i
execute the "make" command, I get the following error:

[ 31%] Built target vhdlparser
[ 31%] [BISON][constexp] Building parser with bison 2.3
constexp.y:43.14-25: syntax error, unexpected string, expecting =
make[2]: *** [generated_src/ce_parse.cpp] Error 1
make[1]: *** [src/CMakeFiles/_doxygen.dir/all] Error 2
make: *** [all] Error 2


I have looked around this forum and others, and can't seem to find an
answer. Some people with similar issues have been suggested to update Bison
or flex, but I have tried that and still get the same error.

Thanks in advance!



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