On Fri, Mar 5, 2010 at 21:13 UTC, Charles Brown wrote: > If the file is; /usr/local/include/package/header.h > and source is; #include <package/header.h> > what goes in configure.ac? > > AC_CHECK_HEADER([package/header.h]) just says 'no'.
AC_CHECK_HEADER and AC_CHECK_HEADERS aren't designed for this situation -- they are used when you simply need to know if it's available so you can #ifdef HAVE_PACKAGE_HEADER_H. You want to ensure they're available by modifying some *CPPFLAGS variable if package/header.h is not found with the default includes. You will probably find bliss down the road of AC_COMPILE_IFELSE in a loop that tries first with no additional -I, then with each of a list of possible include directories, and adds the resulting -I directive to a *CPPFLAGS variable while still respecting any user CPPFLAGS. Cheers, Dave Hart
