Rospack command not found in makefile when trying to build

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Hello, I'm a beginner with ROS and I'm having trouble to build my first packages.

If a use 'rosmake rxtools', for example, I get a 'rospack failed to build' message.

I haven't found how to solve this so I tried to manually make this package, by going to its root directory and running 'make'. When I do this, I get the following message:

sudo make
make: rospack: Command not found
Makefile:1: /cmake.mk: No such file or directory
make: *** No rule to make target `/cmake.mk'.  Stop.

The Makefile looks like

include $(shell rospack find mk)/cmake.mk

So, it seems to me that the rospack command can not be found inside the makefile. I did some little test modifications in the makefile trying to verify this:

test=$(shell rospack find mk)
#include $(shell rospack find mk)/cmake.mk
all:
    @Echo Command result: $(test)

Which gives me this result:

make: rospack: Command not found
Command result:

But I have no idea of why the rospack command cannot be found, neither how to solve this.

I'll really appreciate any sugessitons about how to continue to debug this.