SunOS 11 lines (7 with data), 219 Bytes
include $(depth)/mk/commondefs
include $(depth)/mk/localdefs
ALL_CXXFLAGS = $(CXXFLAGS) $(COMMONCXXFLAGS) $(LOCALCXXFLAGS) \
-DPUTENV_ARG_NOT_CONST
CC = gcc
CXX = g++
LIBSYS = -lpthread -lnsl -lsocket -ldl