Use environment variable to set `include_directories`

Question

I have an environment variable that contains paths to manually 'installed' header only libraries:

export INCLUDE_PATH="/some/path":"${INCLUDE_PATH}"

I want to use this in my CMakeLists.txt. But when I do:

include_directories("$ENV{INCLUDE_PATH}")

the paths appear not be properly added (no CMake error, but the compiler does not know where to look).

Answer 1

You can try to replace the ':' char to ';'. The ';' is the way CMake deals with lists.

string(REPLACE ":" ";" INCLUDE_LIST $ENV{INCLUDE_PATH})

include_directories(${INCLUDE_LIST})