$ autoreconf --install
src/Makefile.am:12: warning: deprecated feature: target 'passivedns' overrides 'passivedns$(EXEEXT)'
src/Makefile.am:12: change your target to read 'passivedns$(EXEEXT)'
/usr/share/automake-1.14/am/program.am: target 'passivedns$(EXEEXT)' was defined here
src/Makefile.am:5: while processing program 'passivedns'
Tested on Ubuntu 14.04 with GNU Autoconf 2.69 and GNU Automake 1.14.1
Basically what the error message tells one to do:
Tested on Ubuntu 14.04 with GNU Autoconf 2.69 and GNU Automake 1.14.1