ifdef() constructs cause problems, make sure to automatically include the m4 directory while regenerating the configure script (provided no ACLOCAL_FLAGS are passed). i.e. ./autogen.sh now just works, even on MacOS X!
Use autoconf 2.5 so that we could get m4sugar macros (AS_VAR_PUSHDEF et al.) and more importantly correct macros for AC_SYS_LARGEFILE support. BTW, also fix test for <linux/if.h>
Handle NO_CONFIGURE variable if we are only generating the configure script
Initial revision
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