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+# gauche scheme environment variables
+# see also ~/.gaucherc
+
+# Warn if ‘#<undef>’ is used in the test expression of branch.  In boolean
+# context, ‘#<undef>’ counts true.  It is also often the case that a procedure
+# returns ‘#<undef>’ when the return value doesn’t matter, and you shouldn’t
+# rely on the value that is supposed not to matter–the procedure may change the
+# return value in future (which should be ok, since the value shouldn’t have
+# mattered), which can cause unintentional and hard-to-track bugs.  *Note
+# Undefined values::, for the details.  We strongly recommend users to turn on
+# this warning.  In future, we plan to make this default.
+GAUCHE_CHECK_UNDEFINED_TEST=1
+export GAUCHE_CHECK_UNDEFINED_TEST
+
+# This is used by ‘gauche.interactive’ module to enable line-editor on REPL
+# prompt. *Note Interactive development::, for the details.
+GAUCHE_READ_EDIT=1
+export GAUCHE_READ_EDIT
+
+# If Gauche is invoked with ‘GAUCHE_READ_EDIT’ enabled (see below), the REPL
+# history is kept in ‘~/.gosh_history’ by default.  This environment variable
+# overrides the history file.  To prohibit saving history, set an empty string
+# to this variable.  If the process is suid/sgid-ed, history won’t be saved.
+GAUCHE_HISTORY_FILE="${XDG_DATA_HOME:-$LOCAL_PREFIX/share}/gauche/gosh_history"
+mkdir -p "${GAUCHE_HISTORY_FILE%/*}"
+export GAUCHE_HISTORY_FILE