--- a/m4macros/ax_crypto.m4
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+++ b/m4macros/ax_crypto.m4
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@@ -330,7 +330,7 @@ EOF
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dnl Check availability of SHA-2
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AC_MSG_CHECKING([support of SHA-2])
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LIBS_SAVED=${LIBS}
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- LIBS="$LIBS $CRYPTO_LIBS"
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+ LIBS="$LIBS $CRYPTO_LIBS -lpthread"
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CPPFLAGS_SAVED=${CPPFLAGS}
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CPPFLAGS="$CRYPTO_INCLUDES $CPPFLAGS"
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AC_LINK_IFELSE(
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