All Linux variants seem to have zip and unzip in /usr/bin, so no need for the extra ifeq to restrict it to ppc.

config/Linux.mk

@@ -132,11 +132,8 @@ JAVA_PROG		= $(JAVA_BIN)java
 PERL			= /usr/bin/perl
 PROCESSOR_ARCHITECTURE	= _$(CPU_ARCH)
 RANLIB			= /usr/bin/ranlib
-
-ifneq ($(CPU_ARCH),ppc)
 UNZIP_PROG		= /usr/bin/unzip
 ZIP_PROG		= /usr/bin/zip
-endif
 
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 # Other