CFLAGS and similar are not added properly

[eugpermar]

If I call ./configure this way:

CPPFLAGS='-I/path/1 -I/path/2' ./configure

Configure script adds the two path properly. However, if I do it this way:

./configure --CPPFLAGS='-I/path/1 -I/path/2'

it only adds the fist added path.