After switching Samba to autocon 2.53 from 2.13 we have started seeing the "WARNING: foo.h: present but cannot be compiled" errors I'm sure you have all fielded questions about in the past. My question is there any chance of having a macro that retains the old behaviour of AC_CHECK_HEADERS, i.e preprocessor check, not compile check? It seems wasteful to me that you now need to keep track of of header file compile dependencies in two places: configure.ac and the project source code. The old CPP-only behaviour only requires this information to be stored in the source. Tim.
