search for: ac_path_tool

...for the architecture you're building for rather than the architecture you're building on. The standard convention for this is to call it HOST-pkg-config, e.g. "arm-linux-gnueabi-pkg-config", just as is normally done for cross-compilers. This implies that configure.ac should use AC_PATH_TOOL rather than AC_PATH_PROG. (Compare with pkg.m4 shipped by pkg-config itself, which uses AC_PATH_TOOL.) contrib/Makefile has a similar issue, but this file isn't generated by autoconf. Perhaps it should be, but in the meantime a simple non-intrusive change is to make pkg-config a variable so...