cups/ppd.h: No such file or directory if CUPS not in standard location

Steps to reproduce:

1) ./configure -cups CUPS_PREFIX=${SOME_NON_STANDARD_LOCATION}

2) make

Result:

In the middle of Qt base build I get

"cups/ppd.h: No such file or directory"

and build fails.

Expected result

Build shouldn't fail.

Additional information:

1) I compile cups myself from source code and install it to ${SOME_NON_STANDARD_LOCATION}

2) There is cups/ppd.h in ${SOME_NON_STANDARD_LOCATION}/include

3) Build completes successfully if I provide

-I ${SOME_NON_STANDARD_LOCATION}/include

during configuration

4) Build would complete successfully if I would install system's package through

apt-get install libcups2-dev

5) providing CUPS_INCDIR during configuration doesn't help