# USE_OBSOLETE_LINKER : use when the linker fails to emit __start_init/__stop_init
# USE_THREAD_DUMP : use the more advanced thread state dump system. Automatic.
# USE_OT : enable the OpenTracing filter
-# EXTRA_MAKE : space-separated list of external addons using a Makefile.inc
# USE_MEMORY_PROFILING : enable the memory profiler. Linux-glibc only.
# USE_LIBATOMIC : force to link with/without libatomic. Automatic.
# USE_PTHREAD_EMULATION : replace pthread's rwlocks with ours
# SILENT_DEFINE may be used to specify other defines which will not be
# reported by "haproxy -vv".
# EXTRA is used to force building or not building some extra tools.
+# EXTRA_MAKE space-separated list of external addons using a Makefile.inc
# DESTDIR is not set by default and is used for installation only.
# It might be useful to set DESTDIR if you want to install haproxy
# in a sandbox.