the ACLOCAL_PATH functionality is useful (adding search dirs after -I), but a bit unwieldy as an env var. any reason we can't add a command line option for this ? call it --aclocal-path ? or --extra-system-acdir ? or some other other boring name ?
for context, when cross-compiling, autotools (i.e. automake) tend to be installed in the system (i.e. /usr/), while all the libraries & macros being built against are found in a separate sysroot (e.g. ~/sysroot/). we want to insert that ~/sysroot/usr/share/aclocal path after the set of -I flags from the package, but before /usr/share/aclocal. -mike
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