I'm trying to install the SAIDEX planner on the Ubuntu platform and came across an error.

[pyrdesilva]

          I'm trying to install the SAIDEX planner on the Ubuntu platform and came across an error.

The source code was taken from https://gitlab.anu.edu.au/u1092535/htn2020-competitor-2/-/tree/master/planner

src/lexer.cpp:4149:20: error: no declaration matches ‘void yyFlexLexer::yypop_buffer_state()’
4149 | return;
| ^~~~
src/lexer.cpp:4149:20: note: no functions named ‘void yyFlexLexer::yypop_buffer_state()’
src/lexer.cpp:23:25: note: ‘class yyFlexLexer’ defined here
23 | #define yyFlexLexer yyFlexLexer
| ^~~~~~~~~~~
src/lexer.cpp:4168:6: error: no declaration matches ‘void yyFlexLexer::yyensure_buffer_stack()’
4168 |
| ^
src/lexer.cpp:4168:6: note: no functions named ‘void yyFlexLexer::yyensure_buffer_stack()’
src/lexer.cpp:23:25: note: ‘class yyFlexLexer’ defined here
23 | #define yyFlexLexer yyFlexLexer
| ^~~~~~~~~~~
gmake[2]: *** [CMakeFiles/planner.dir/build.make:116: CMakeFiles/planner.dir/src/lexer.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/planner.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2

The total log
saidex cmake error_log.txt

I'm a Data Science student at the University of Sri Jayewardenepura from Sri Lanka (https://www.sjp.ac.lk/).

Originally posted by @pyrdesilva in #5 (comment)