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dnl as-ac-expand.m4 0.1.0
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dnl autostars m4 macro for expanding directories using configure's prefix
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dnl thomas@apestaart.org
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dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR)
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dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir)
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dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/local
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AC_DEFUN(AS_AC_EXPAND,
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dnl first expand prefix and exec_prefix if necessary
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exec_prefix_save=$exec_prefix
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dnl if no prefix given, then use /usr/local, the default prefix
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if test "x$prefix" = "xNONE"; then
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prefix=$ac_default_prefix
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dnl if no exec_prefix given, then use prefix
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if test "x$exec_prefix" = "xNONE"; then
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dnl loop until it doesn't change anymore
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new_full_var="`eval echo $full_var`"
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if test "x$new_full_var"="x$full_var"; then break; fi
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full_var=$new_full_var
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full_var=$new_full_var
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AC_SUBST([$1], "$full_var")
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dnl restore prefix and exec_prefix
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exec_prefix=$exec_prefix_save