Hello,
I am following the instructions for the installation in a virtual environment.
I run the command:
./configure --prefix=/usr/local/Cellar LDFLAGS="-L/usr/local/lib" 
I get the error “Could not link test program to Python” with the suggestion to pass LIBS or LDFLAGS variables. 
From the config.log gives the following error:

clang: error: no such file or directory: 'Python.framework/Versions/3.6/Python'

This error occurs in the following line, something to do with CoreFoundation:

configure:19079: gcc -o conftest -g -O2 -DNDEBUG  -I/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/include/python3.6m -L/usr/local/lib -Wl,-stack_size,1000000  -framework CoreFoundation Python.framework/Versions/3.6/Python conftest.c  -L/usr/local/opt/python3/Frameworks/Python.framework/Versions/3.6/lib -lpython3.6m -ldl  -framework CoreFoundation  -ldl  -framework CoreFoundation  >&5

I have two questions:
How can I pass the variable for this line?
How can I find out what the right path is?

Thank you,
Duccio