Linux 12 lines (8 with data), 246 Bytes
include $(depth)/mk/commondefs
include $(depth)/mk/localdefs
ALL_CXXFLAGS = $(CXXFLAGS) $(COMMONCXXFLAGS) $(LOCALCXXFLAGS) \
-D_GNU_SOURCE \
-DPUTENV_ARG_NOT_CONST \
-DHAVE_VASPRINTF=1 \
-DHAVE_MKDTEMP=1
LIBSYS = -lpthread -ldl