asterisk/third-party/Makefile.rules

ifeq ($(NOISY_BUILD),)
SUBMAKE?=$(MAKE) --quiet --no-print-directory
ECHO_PREFIX?=@
CMD_PREFIX?=@
QUIET_CONFIGURE=-q
REALLY_QUIET=>/dev/null 2>&1
else
SUBMAKE?=$(MAKE)
ECHO_PREFIX?=@\#
CMD_PREFIX?=
QUIET_CONFIGURE=
REALLY_QUIET=
endif

export SUBMAKE
export ECHO_PREFIX
export CMD_PREFIX
export QUIET_CONFIGURE
export REALLY_QUIET
export ASTTOPDIR
export ASTSBINDIR
export DESTDIR
export ASTDATADIR
export TAR
export PATCH
export SED
export NM
export DOWNLOAD