configure: Preserve the user's $CPPFLAGS and $LDFLAGS.
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@ -41,8 +41,8 @@ AC_SUBST(nix)
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old_CPPFLAGS="$CPPFLAGS"
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old_LIBS="$LIBS"
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CPPFLAGS="-I$nix/include/nix"
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LDFLAGS="-L$nix/lib/nix"
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CPPFLAGS="$CPPFLAGS -I$nix/include/nix"
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LDFLAGS="$LDFLAGS -L$nix/lib/nix"
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AC_CHECK_HEADER([store-api.hh], [:],
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[AC_MSG_ERROR([Nix headers not found; please install Nix or check the `--with-nix' option.])])
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