AC_INIT(myconfig, 0.1) AC_PROG_CXX() AC_LANG(C++) CFLAGS="-DDEBUG -g" AC_CHECK_HEADERS([pcap.h gtest/gtest.h]) AC_CHECK_LIB(pcap, pcap_loop, [], [AC_MSG_ERROR([pcap library is needed!])]) #AC_CHECK_LIB([gtest_main], [main], [], [AC_MSG_ERROR([gtest library is needed!])]) AC_SUBST(CFLAGS) AC_OUTPUT(Makefile)