(see buildroot/Config.in config BR2_ZCAT and BR2_BZCAT that are available as ZCAT and BZCAT). Thanks..
AVAHI_DIR:=$(BUILD_DIR)/avahi-$(AVAHI_VER)
AVAHI_SITE:=http://www.avahi.org/download/
AVAHI_SOURCE:=avahi-$(AVAHI_VER).tar.gz
-AVAHI_CAT:=zcat
+AVAHI_CAT:=$(ZCAT)
$(DL_DIR)/$(AVAHI_SOURCE):
$(WGET) -P $(DL_DIR) $(AVAHI_SITE)/$(AVAHI_SOURCE)
DMALLOC_SOURCE:=dmalloc-$(DMALLOC_VER).tgz
DMALLOC_SITE:=http://dmalloc.com/releases
DMALLOC_DIR:=$(BUILD_DIR)/dmalloc-$(DMALLOC_VER)
-DMALLOC_CAT:=zcat
+DMALLOC_CAT:=$(ZCAT)
DMALLOC_BINARY:=dmalloc
DMALLOC_TARGET_BINARY:=usr/bin/dmalloc
LIBDAEMON_DIR:=$(BUILD_DIR)/libdaemon-$(LIBDAEMON_VER)
LIBDAEMON_SITE:=http://0pointer.de/lennart/projects/libdaemon/
LIBDAEMON_SOURCE:=libdaemon-$(LIBDAEMON_VER).tar.gz
-LIBDAEMON_CAT:=zcat
+LIBDAEMON_CAT:=$(ZCAT)
$(DL_DIR)/$(LIBDAEMON_SOURCE):
$(WGET) -P $(DL_DIR) $(LIBDAEMON_SITE)/$(LIBDAEMON_SOURCE)
MPATROL_SOURCE:=mpatrol_$(MPATROL_VER).tar.gz
MPATROL_SITE:=http://www.cbmamiga.demon.co.uk/mpatrol/files
MPATROL_DIR:=$(BUILD_DIR)/mpatrol
-MPATROL_CAT:=zcat
+MPATROL_CAT:=$(ZCAT)
MPATROL_BINARY:=mleak
MPATROL_BUILD_DIR:=$(MPATROL_DIR)/build/unix
MPATROL_TARGET_BINARY:=usr/bin/mleak
NETPLUG_SOURCE=netplug-$(NETPLUG_VER).tar.bz2
NETPLUG_SITE=http://www.red-bean.com/~bos/netplug
NETPLUG_DIR=$(BUILD_DIR)/netplug-$(NETPLUG_VER)
-NETPLUG_CAT:=bzcat
+NETPLUG_CAT:=$(BZCAT)
NETPLUG_BINARY:=netplugd
NETPLUG_TARGET_BINARY:=sbin/netplugd