../../src/tclhash.h:78:13: warning: inline function ‘garbage_collect_tclhash’ declared but never defined
 inline void garbage_collect_tclhash(void);
             ^~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../src/main.h:107:0,
                 from strftime.c:26:
../../src/proto.h:274:12: warning: inline function ‘open_listen’ declared but never defined
 inline int open_listen(int *);
            ^~~~~~~~~~~
make[2]: Leaving directory '/home/Arthur/eggdrop1.8/src/compat'

---------- Yeah! That's the compiling, now the linking! ----------

Linking eggdrop (debug version).

gcc -o ../eggdrop bg.o botcmd.o botmsg.o botnet.o chanprog.o cmds.o dcc.o dccutil.o dns.o flags.o language.o match.o main.o mem.o misc.o misc_file.o modules.o net.o rfc1459.o tcl.o tcldcc.o tclhash.o tclmisc.o tcluser.o tls.o userent.o userrec.o users.o  -L/usr/lib/x86_64-linux-gnu -ltcl8.6 -lm -ldl -lnsl  -lpthread md5/md5c.o compat/*.o `cat mod/mod.xlibs`
main.o: In function `garbage_collect':
/home/Arthur/eggdrop1.8/src/./main.c:737: undefined reference to `garbage_collect_tclhash'
modules.o:(.data.rel+0x2a0): undefined reference to `open_listen'
tcldcc.o: In function `tcl_listen':
/home/Arthur/eggdrop1.8/src/tcldcc.c:957: undefined reference to `open_listen'
collect2: error: ld returned 1 exit status
Makefile:37: recipe for target '../eggdrop' failed
make[1]: *** [../eggdrop] Error 1
make[1]: Leaving directory '/home/Arthur/eggdrop1.8/src'
Makefile:240: recipe for target 'debegg' failed
make: *** [debegg] Error 2