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dnl -*- Autoconf -*-
AC_DEFUN([RUBY_CHECK_HEADER],
[# RUBY_CHECK_HEADER($@)
save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS m4_if([$5], [], [$INCFLAGS], [$5])"
AC_CHECK_HEADERS([$1], [$2], [$3], [$4])
CPPFLAGS="$save_CPPFLAGS"
unset save_CPPFLAGS])
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