[CMake] Using find_program() command to search in only one given directory

[Nicholas Kinar]

  Hello,

Suppose that I have a program (named "my-config") that is on the *NIX 
system path, and I have another version of the program (also named 
"my-config") in a sub-folder of the HOME directory.

How would I use the find_program() command to determine if the program 
exists, given the search directory?  In other words, given a variable 
with the path to the program (CONFIG_EXECUTABLE_PATH), how do I force 
the find_program() command to search only in the path specified by that 
particular variable?

I've been trying to use the find_program() command with the 
NO_DEFAULT_PATH modifier, but this does not seem to be working, since 
cmake will only find the program on the *NIX system path:

find_program(CONFIG_EXECUTABLE NAMES my-config PATHS 
${CONFIG_EXECUTABLE_PATH}  NO_DEFAULT_PATH)

Alternately, must I simply set the path to the program using the 
following command?

set(CONFIG_EXECUTABLE, ${CONFIG_EXECUTABLE_PATH}/my-config)

Nicholas