configure: Define AS_VAR_APPEND if necessary for older autoconf versions.
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@ -11,6 +11,10 @@ AC_CONFIG_SRCDIR(server/atom.c)
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AC_CONFIG_HEADERS(include/config.h)
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AC_CONFIG_AUX_DIR(tools)
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dnl autoconf versions before 2.63b don't have AS_VAR_APPEND
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m4_ifdef([AS_VAR_APPEND],,[as_fn_append () { eval $[1]=\$$[1]\$[2]; }
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AC_DEFUN([AS_VAR_APPEND],[as_fn_append $1 $2])])dnl
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dnl **** Command-line arguments ****
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AC_ARG_ENABLE(win16, AS_HELP_STRING([--disable-win16],[do not include Win16 support]))
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