The issue on Puhti was that it was missing a static flex library which would have provided the function yywrap. Fixed by removing the static library dependency and adding option noyywrap to the lexer generator file

acc/src/CMakeLists.txt

@@ -8,4 +8,3 @@ add_flex_bison_dependency(acc_lexer acc_parser)
 
 add_executable(acc code_generator.c ${BISON_acc_parser_OUTPUTS} ${FLEX_acc_lexer_OUTPUTS})
 target_include_directories(acc PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
-target_link_libraries(acc ${FLEX_LIBRARIES})

acc/src/acc.l

@@ -1,4 +1,5 @@
 %option yylineno
+%option noyywrap
 
 D [0-9]
 L [a-zA-Z_]