Hi Marc,
Thank you for the quick respond. I received the following error when issue the "make" on "Red Hat Enterprise Linux 9".
make[2]: Leaving directory '/root/event-driven-servers/tac_plus/extra'
make[2]: Entering directory '/root/event-driven-servers/build/linux-5.14.0-427.42.1.el9_4.x86_64-x86_64/tac_plus'
make[3]: Entering directory '/root/event-driven-servers/build/linux-5.14.0-427.42.1.el9_4.x86_64-x86_64/tac_plus'
make[4]: Entering directory '/root/event-driven-servers/tac_plus/extra'
make[4]: Nothing to be done for 'install'.
make[4]: Leaving directory '/root/event-driven-servers/tac_plus/extra'
make[3]: Leaving directory '/root/event-driven-servers/build/linux-5.14.0-427.42.1.el9_4.x86_64-x86_64/tac_plus'
make[2]: Leaving directory '/root/event-driven-servers/build/linux-5.14.0-427.42.1.el9_4.x86_64-x86_64/tac_plus'
make[1]: Leaving directory '/root/event-driven-servers/tac_plus'
make[1]: Entering directory '/root/event-driven-servers/tac_plus-ng'
make[2]: Entering directory '/root/event-driven-servers/tac_plus-ng/extra'
make[2]: Nothing to be done for 'all'.
make[2]: Leaving directory '/root/event-driven-servers/tac_plus-ng/extra'
make[2]: Entering directory '/root/event-driven-servers/build/linux-5.14.0-427.42.1.el9_4.x86_64-x86_64/tac_plus-ng'
gcc -o tac_plus-ng acct.o authen.o author.o buffer.o config.o dump.o main.o mavis.o packet.o report.o utils.o context.o udp-spoof.o -Wl,-rpath,$ORIGIN/../lib64 -L/root/event-driven-servers/build/linux-5.14.0-427.42.1.el9_4.x86_64-x86_64/mavis -Wl,-rpath,/usr/local/lib64 -lmavis -L/usr/lib64 -Wl,-rpath,/usr/lib64 -lcrypt
/bin/ld: config.o: in function `rad_get_password':
config.c:(.text+0x454c): undefined reference to `password_is_printable'
collect2: error: ld returned 1 exit status
make[2]: *** [/root/event-driven-servers/tac_plus-ng/Makefile.obj:27: tac_plus-ng] Error 1
make[2]: Leaving directory '/root/event-driven-servers/build/linux-5.14.0-427.42.1.el9_4.x86_64-x86_64/tac_plus-ng'
make[1]: *** [GNUmakefile:24: build] Error 2
make[1]: Leaving directory '/root/event-driven-servers/tac_plus-ng'
make: *** [GNUmakefile:31: dirs] Error 1