Extract from our CI build log:

cc -pipe -Wall -D_LINUX -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -I../../.. -D_OPENSSL_MD4 -g3 -ggdb -g asleap.c -o asleap common.o utils.o sha1.o -lpcap -lcrypt -lcrypto
asleap.c: In function 'main':
asleap.c:1398:6: warning: variable 'findleaptimeout' set but not used [-Wunused-but-set-variable]
  int findleaptimeout = 5;
      ^~~~~~~~~~~~~~~
/usr/bin/ld: utils.o: in function `DesEncrypt':
/builds/kalilinux/packages/asleap/debian/output/asleap-2.2/utils.c:179: undefined reference to `setkey'
/usr/bin/ld: /builds/kalilinux/packages/asleap/debian/output/asleap-2.2/utils.c:182: undefined reference to `encrypt'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:31: asleap] Error 1
make[1]: Leaving directory '/builds/kalilinux/packages/asleap/debian/output/asleap-2.2'
dh_auto_build: make -j1 returned exit code 2
make: *** [debian/rules:4: build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2