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authorkeke <librek@protonmail.com>2021-06-02 18:09:03 +0800
committerkeke <librek@protonmail.com>2021-06-02 18:09:03 +0800
commit50dc88a56cc13030801bfefc7116828d4115ae70 (patch)
treed9435d00e32722c89af920419bad6db6439d74c6 /src/libfetchers
parent7c3cb8506fb3046cb97e1b98f3b1195d45c500f3 (diff)
fix error: 'optional' in namespace 'std' does not name a template type
Diffstat (limited to 'src/libfetchers')
-rw-r--r--src/libfetchers/attrs.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libfetchers/attrs.hh b/src/libfetchers/attrs.hh
index a2d53a7bf..e41037633 100644
--- a/src/libfetchers/attrs.hh
+++ b/src/libfetchers/attrs.hh
@@ -6,6 +6,8 @@
#include <nlohmann/json_fwd.hpp>
+#include <optional>
+
namespace nix::fetchers {
typedef std::variant<std::string, uint64_t, Explicit<bool>> Attr;