use slightly more portable unpack constructs

Makefile

@@ -100,7 +100,7 @@ $(SOURCE_DIR)/$(LINUX_SOURCE):
 
 $(LINUX_DIR)/.unpacked:	$(SOURCE_DIR)/$(LINUX_SOURCE)
 	rm -rf $(LINUX_DIR) # Keeps old versions from messing things up
-	bunzip2 -c $(SOURCE_DIR)/$(LINUX_SOURCE) | tar -xv
+	bzip2 -dc $(SOURCE_DIR)/$(LINUX_SOURCE) | tar -xvf -
 	touch $(LINUX_DIR)/.unpacked
 
 $(SOURCE_DIR)/$(USERMODELINUX_PATCH):
@@ -148,7 +148,7 @@ $(SOURCE_DIR)/$(UCLIBC_SOURCE):
 
 $(UCLIBC_DIR)/Config:	$(SOURCE_DIR)/$(UCLIBC_SOURCE)
 	rm -rf $(UCLIBC_DIR) # Make sure no previous version interferes here
-	gzip -d -c $(SOURCE_DIR)/$(UCLIBC_SOURCE) | tar xf -
+	gzip -d -c $(SOURCE_DIR)/$(UCLIBC_SOURCE) | tar -xvf -
 	# The next step patches uClibc
 	# Place patches in the source directory, named uClibc-*.patch
 	for p in `find $(SOURCE_DIR) -name uClibc-*.patch | sort -g`;do \

boa.mk

@@ -22,7 +22,7 @@ $(SOURCE_DIR)/$(BOA_SOURCE):
 	done
 
 $(BOA_DIR)/.unpacked:	$(SOURCE_DIR)/$(BOA_SOURCE)
-	tar -xzf $(SOURCE_DIR)/$(BOA_SOURCE)
+	gzip -d -c $(SOURCE_DIR)/$(BOA_SOURCE) | tar -xvf -
 	touch $(BOA_DIR)/.unpacked
 
 $(BOA_WORKDIR)/Makefile: $(TARGET_CC) $(BOA_DIR)/.unpacked

busybox.mk

@@ -22,7 +22,7 @@ $(SOURCE_DIR)/$(BUSYBOX_SOURCE):
 
 $(BUSYBOX_DIR)/.unpacked:	$(SOURCE_DIR)/$(BUSYBOX_SOURCE)
 	rm -rf $(BUSYBOX_DIR) # Make sure no older version interferes
-	tar -xzf $(SOURCE_DIR)/$(BUSYBOX_SOURCE)
+	gzip -d -c $(SOURCE_DIR)/$(BUSYBOX_SOURCE) | tar -xvf -
 	touch $(BUSYBOX_DIR)/.unpacked
 	
 $(BUSYBOX_WORKDIR)/.config:	$(BUSYBOX_DIR)/.unpacked