+
+$(eval $(call RequireCommand,python, \
+ Please install python. \
+))
+
+$(eval $(call RequireCommand,wget, \
+ Please install wget. \
+))
+
+$(eval $(call RequireCommand,git, \
+ Please install git (git-core). \
+))
+
+define Require/gnutar
+ $(TAR) --version 2>&1 | grep GNU > /dev/null
+endef
+
+$(eval $(call Require,gnutar, \
+ Please install GNU tar. \
+))
+
+$(eval $(call RequireCommand,svn, \
+ Please install the subversion client. \
+))
+
+define Require/gnu-find
+ $(FIND) --version 2>/dev/null
+endef
+
+$(eval $(call Require,gnu-find, \
+ Please install GNU find \
+))
+
+define Require/getopt-extended
+ getopt --long - - >/dev/null
+endef
+
+$(eval $(call Require,getopt-extended, \
+ Please install an extended getopt version that supports --long \
+))