undefined reference to `clock_gettime'

[isgroup-srl]

With both the 0.5 package from https://nmap.org/ncrack/ and git clone https://github.com/nmap/ncrack on Ubuntu 14.04.5 LTS there is a compilation error:

g++ -Lnbase -Lnsock/src -Lopensshlib   -o ncrack ncrack.o utils.o TargetGroup.o Target.o targets.o NcrackOps.o Service.o ServiceGroup.o Connection.o services.o timing.o ncrack_error.o output.o ncrack_tty.o Buf.o NcrackOutputTable.o ncrack_input.o ncrack_resume.o crypto.o http.o http_digest.o modules/ncrack_ssh.o modules/ncrack_smb.o modules/ncrack_rdp.o modules/ncrack_sip.o modules/ncrack_psql.o modules/ncrack_mysql.o modules/ncrack_ftp.o modules/ncrack_telnet.o modules/ncrack_http.o modules/ncrack_pop3.o modules/ncrack_vnc.o modules/ncrack_redis.o modules/ncrack_winrm.o modules/ncrack_owa.o modules/ncrack_imap.o -lnsock -lnbase -lssl -lcrypto -lopenssh 
opensshlib/libopenssh.a(misc.o): In function `monotime':
ncrack/opensshlib/misc.c:918: undefined reference to `clock_gettime'
ncrack/opensshlib/misc.c:922: undefined reference to `clock_gettime'
collect2: ld returned 1 exit status
make[1]: *** [ncrack] Error 1
make[1]: Leaving directory `bin/ncrack'
make: *** [all] Error 2

Changing Makefile as follows fix the issue:

LDFLAGS = -Lnbase -Lnsock/src -Lopensshlib -L $(DBGFLAGS) $(STATIC)
LDADD=-lrt

But then after a make clean and make I get:

g++ -Lnbase -Lnsock/src -Lopensshlib -L   -o ncrack ncrack.o utils.o TargetGroup.o Target.o targets.o NcrackOps.o Service.o ServiceGroup.o Connection.o services.o timing.o ncrack_error.o output.o ncrack_tty.o Buf.o NcrackOutputTable.o ncrack_input.o ncrack_resume.o crypto.o http.o http_digest.o modules/ncrack_ssh.o modules/ncrack_smb.o modules/ncrack_rdp.o modules/ncrack_sip.o modules/ncrack_psql.o modules/ncrack_mysql.o modules/ncrack_ftp.o modules/ncrack_telnet.o modules/ncrack_http.o modules/ncrack_pop3.o modules/ncrack_vnc.o modules/ncrack_redis.o modules/ncrack_winrm.o modules/ncrack_owa.o modules/ncrack_imap.o -lnsock -lnbase -lssl -lcrypto -lopenssh 
g++: error: ncrack: No such file or directory
make[1]: *** [ncrack] Error 1
make[1]: Leaving directory `bin/ncrack'
make: *** [all] Error 2

Thanks,
Francesco

[isgroup-srl]

Reference to librt.so "Real Time" shared library solution: http://stackoverflow.com/questions/2418157/ubuntu-linux-c-error-undefined-reference-to-clock-gettime-and-clock-settim

[vpnguy-zz]

LDFLAGS = -Lnbase -Lnsock/src -Lopensshlib $(DBGFLAGS) $(STATIC) -lrt

Did the trick for me

[bgqueengeek]

Thanks so much, the above LDFLAGS syntax worked for me as well!