How can I set ccshared=-fPIC while executing ./configure?

The following worked for me when I ran into this error:

make clean
./configure CFLAGS=-fPIC CXXFLAGS=-fPIC

Run configure with --enable-shared. Then -fPIC will be included as part of the shared flags.

I got it working by adding -fPIC after CC= gcc -pthread, i.e CC= gcc -pthread -fPIC in the Makefile.