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AC_DEFUN([AC_TEST_ZSTD_STREAM], [
AC_MSG_CHECKING([whether zstd supports stream compression])
AC_LANG_PUSH([C])
ac_zstd_have_stream="no"
ac_zstd_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $ZSTD_CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <zstd.h>], [ZSTD_EndDirective op = ZSTD_e_end; ZSTD_compressStream2(NULL, NULL, NULL, op);])],
ac_zstd_have_stream="yes"
AC_MSG_RESULT([yes]), AC_MSG_RESULT([no]))
AS_IF([test "x$ac_zstd_have_stream" = "xyes"],
[AC_DEFINE(HAVE_ZSTD_STREAM, 1, [Does zstd support stream compression?])])
AM_CONDITIONAL([HAVE_ZSTD_STREAM], [test "x$ac_zstd_have_stream" = "xyes"])
CFLAGS=$ac_zstd_save_CFLAGS
AC_LANG_POP([C])
])
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