ImportError: No module named ...

After embeding a Python module into a C app., when running it, errors poped,

ImportError: No module named pyfunction   

The solution is

1) in a Console, run 

gcc first.c -o first `python-config --cflags` `python-config --ldflags`

PYTHONPATH=. ./first

2) a second alternative solution is

after building the c file as above, run with the folowing shell:

#OK
export PYTHONPATH=./first
first/first

This is also OK