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-rw-r--r--src/libutil/compression.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libutil/compression.hh b/src/libutil/compression.hh
index 962ce5ac7767..eb1697fc4aa4 100644
--- a/src/libutil/compression.hh
+++ b/src/libutil/compression.hh
@@ -4,6 +4,8 @@
 
 namespace nix {
 
+std::string compressXZ(const std::string & in);
+
 std::string decompressXZ(const std::string & in);
 
 }