ubuntu 12.04 make error and workaround (vsftpd)

/vsftpd-2.3.4# make
gcc -o vsftpd main.o utility.o prelogin.o ftpcmdio.o postlogin.o privsock.o tunables.o ftpdataio.o secbuf.o ls.o postprivparent.o logging.o str.o netstr.o sysstr.o strlist.o banner.o filestr.o parseconf.o secutil.o ascii.o oneprocess.o twoprocess.o privops.o standalone.o hash.o tcpwrap.o ipaddrparse.o access.o features.o readwrite.o opts.o ssl.o sslslave.o ptracesandbox.o ftppolicy.o sysutil.o sysdeputil.o -Wl,-s `./vsf_findlibs.sh`
sysdeputil.o: In function `vsf_sysdep_has_capabilities':
sysdeputil.c:(.text+0x1d9): undefined reference to `cap_get_proc'
sysdeputil.c:(.text+0x1e4): undefined reference to `cap_free'
sysdeputil.o: In function `vsf_sysdep_adopt_capabilities':
sysdeputil.c:(.text+0x219): undefined reference to `cap_init'
sysdeputil.c:(.text+0x22f): undefined reference to `cap_set_proc'
sysdeputil.c:(.text+0x245): undefined reference to `cap_free'
sysdeputil.c:(.text+0x26e): undefined reference to `cap_set_flag'
sysdeputil.c:(.text+0x28b): undefined reference to `cap_set_flag'
sysdeputil.c:(.text+0x2b6): undefined reference to `cap_set_flag'
sysdeputil.c:(.text+0x2d3): undefined reference to `cap_set_flag'
sysdeputil.o: In function `vsf_sysdep_check_auth':
sysdeputil.c:(.text+0xc23): undefined reference to `pam_start'
sysdeputil.c:(.text+0xc58): undefined reference to `pam_set_item'
sysdeputil.c:(.text+0xc76): undefined reference to `pam_set_item'
sysdeputil.c:(.text+0xc9a): undefined reference to `pam_set_item'
sysdeputil.c:(.text+0xcb0): undefined reference to `pam_authenticate'
sysdeputil.c:(.text+0xcce): undefined reference to `pam_get_item'
sysdeputil.c:(.text+0xced): undefined reference to `pam_acct_mgmt'
sysdeputil.c:(.text+0xd02): undefined reference to `pam_setcred'
sysdeputil.c:(.text+0xd29): undefined reference to `pam_open_session'
sysdeputil.c:(.text+0xd5a): undefined reference to `pam_end'
sysdeputil.c:(.text+0xd82): undefined reference to `pam_end'
sysdeputil.c:(.text+0xd95): undefined reference to `pam_end'
sysdeputil.c:(.text+0xdc0): undefined reference to `pam_setcred'
sysdeputil.c:(.text+0xdce): undefined reference to `pam_end'
sysdeputil.o: In function `vsf_auth_shutdown':
sysdeputil.c:(.text+0xe03): undefined reference to `pam_close_session'
sysdeputil.c:(.text+0xe14): undefined reference to `pam_setcred'
sysdeputil.c:(.text+0xe22): undefined reference to `pam_end'
collect2: ld returned 1 exit status
make: *** [vsftpd] Error 1

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contents of:  vsf_findlibs.sh
============================================================

#!/bin/sh
# Cheesy hacky location of additional link libraries.

locate_library() { [ ! "$1*" = "`echo $1*`" ]; }
find_func() { egrep $1 $2 >/dev/null; }

if find_func hosts_access tcpwrap.o; then
  echo "-lwrap";
  locate_library /lib/libnsl.so && echo "-lnsl";
  locate_library /lib64/libnsl.so && echo "-lnsl";
fi

# Look for PAM (done weirdly due to distribution bugs (e.g. Debian) or the
# crypt library.
if find_func pam_start sysdeputil.o; then
  locate_library /lib/libpam.so.0 && echo "/lib/libpam.so.0";
  locate_library /usr/lib/libpam.so && echo "-lpam";
  locate_library /usr/lib64/libpam.so && echo "-lpam";
  # HP-UX ends shared libraries with .sl
  locate_library /usr/lib/libpam.sl && echo "-lpam";
  # AIX ends shared libraries with .a
  locate_library /usr/lib/libpam.a && echo "-lpam";
else
  locate_library /lib/libcrypt.so && echo "-lcrypt";
  locate_library /usr/lib/libcrypt.so && echo "-lcrypt";
  locate_library /usr/lib64/libcrypt.so && echo "-lcrypt";
fi

# Look for the dynamic linker library. Needed by older RedHat when
# you link in PAM
locate_library /lib/libdl.so && echo "-ldl";

# Look for libsocket. Solaris needs this.
locate_library /lib/libsocket.so && echo "-lsocket";

# Look for libnsl. Solaris needs this.
locate_library /lib/libnsl.so && echo "-lnsl";

# Look for libresolv. Solaris needs this.
locate_library /lib/libresolv.so && echo "-lresolv";

# Look for libutil. Older FreeBSD need this for setproctitle().
locate_library /usr/lib/libutil.so && echo "-lutil";

# For older HP-UX...
locate_library /usr/lib/libsec.sl && echo "-lsec";

# Look for libcap (capabilities)
if locate_library /lib/libcap.so.1; then
  echo "/lib/libcap.so.1";
elif locate_library /lib/libcap.so.2; then
  echo "/lib/libcap.so.2";
else
  locate_library /usr/lib/libcap.so && echo "-lcap";
  locate_library /lib/libcap.so && echo "-lcap";
  locate_library /lib64/libcap.so && echo "-lcap";
fi

# Solaris needs this for nanosleep()..
locate_library /lib/libposix4.so && echo "-lposix4";
locate_library /usr/lib/libposix4.so && echo "-lposix4";

# Tru64 (nanosleep)
locate_library /usr/shlib/librt.so && echo "-lrt";

# Solaris sendfile
locate_library /usr/lib/libsendfile.so && echo "-lsendfile";

# OpenSSL
if find_func SSL_library_init ssl.o; then
  echo "-lssl -lcrypto";
fi

exit 0;


============================================================
workaround/problem remedied by:
============================================================

apt-get build-dep vsftpd
make LIBS='-lwrap -lpam -lssl -lcrypto -lcap'