Problem building aros from source

Hi, i hope this is the right way to ask for help. I'm trying to build aros from sources, and the configure phase went smoothly. And i did also the `git submodule update --init --recursive`. But when i launch make, it fail with this flex error: ``` [MMAKE] Making mesa3d-linklib-compiler-generated in workbench/libs/mesa/libcompiler Generating Lex file bin/linux-x86_64/gen/workbench/libs/mesa/20.0.8/src/compiler/glsl/glsl_lexer.cpp flex: Can't use --reentrant or --bison-bridge with -l option make[1]: *** [mmakefile:72: /home/rincewind/Projects/AROS-build/bin/linux-x86_64/gen/workbench/libs/mesa/20.0.8/src/compiler/glsl/glsl_lexer.cpp] Error 1 [MMAKE] make --no-print-directory TOP=/home/rincewind/Projects/AROS-build SRCDIR=/home/rincewind/Projects/AROS CURDIR=workbench/libs/mesa/libcompiler TARGET=mesa3d-linklib-compiler-generated --file=mmakefile mesa3d-linklib-compiler-generated failed: 512 [MMAKE] Error: Error while running make in workbench/libs/mesa/libcompiler: No such file or directory ``` The flex version installed is: ``` rincewind@MyRouter:~/Projects/AROS-build> flex --version flex 2.6.4 ``` On opensuse Tumbleweed. Am i doing something wrong? Or did i miss some step?