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-rw-r--r--src/libstore/build.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 572634765..e0c7324c7 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -3678,7 +3678,8 @@ void DerivationGoal::registerOutputs()
/* The output path should be a regular file without execute permission. */
if (!S_ISREG(st.st_mode) || (st.st_mode & S_IXUSR) != 0)
throw BuildError(
- format("output path '%1%' should be a non-executable regular file") % path);
+ format("output path '%1%' should be a non-executable regular file "
+ "since recursive hashing is not enabled (outputHashMode=flat).") % path);
}
/* Check the hash. In hash mode, move the path produced by