Check if a program exists from a Makefile

Question

How can I check if a program is callable from a Makefile?

(That is, the program should exist in the path or otherwise be callable.)

It could be used to chec

Answer 1

Solved by compiling a special little program in another makefile target, whose sole purpose is to check for whatever runtime stuff I was looking for.

Then, I called this program in yet another makefile target.

It was something like this if I recall correctly:

real: checker real.c
    cc -o real real.c `./checker`

checker: checker.c
    cc -o checker checker.c