This is what appears in my config.log:

[...] configure:56206: checking /usr/local/include configure:56249: gcc -E -I/home/marcus/Pike/7.7/build/linux-2.6.8dma-ppc/bundles/include -I/usr/local/include conftest.c configure:56255: $? = 0 configure:56268: result: added [...]