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diff --git a/acinclude.m4 b/acinclude.m4
index a7bc0fa..1a5bffc 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -76,13 +76,14 @@ case "${host}" in
i386-emx-os2 | i[3456]86-pc-os2*emx | i386-pc-msdosdjgpp)
ac_cv_sys_symbol_underscore=yes
;;
- *)
- if test "$cross_compiling" = yes; then
- if test "x$ac_cv_sys_symbol_underscore" = x ; then
- ac_cv_sys_symbol_underscore=yes
- fi
- else
- tmp_do_check="yes"
+ *) if test -z "$ac_cv_sys_symbol_underscore"; then
+ if test "$cross_compiling" = yes; then
+ if test "x$ac_cv_sys_symbol_underscore" = x ; then
+ ac_cv_sys_symbol_underscore=yes
+ fi
+ else
+ tmp_do_check="yes"
+ fi
fi
;;
esac
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