diff --git a/.github/workflows/build-rhel7.yml b/.github/workflows/build-rhel7.yml
index e9c3436..aa9118d 100644
--- a/.github/workflows/build-rhel7.yml
+++ b/.github/workflows/build-rhel7.yml
@@ -55,12 +55,12 @@ jobs:
       - run: ls -la /root
       - run: rustc --version
       - run: cargo --version
-      - run: mkdir /build
       - run: yum install -y git
-      - run: git clone https://github.com/paulscherrerinstitute/daqingest.git
+      - run: mkdir /build
+      - run: git clone --branch dev https://github.com/paulscherrerinstitute/daqbuffer.git
+        working-directory: /build
+      - run: git clone --branch dev https://github.com/paulscherrerinstitute/daqingest.git
         working-directory: /build
-      - run: git checkout dev
-        working-directory: /build/daqingest
       - run: cargo build
         working-directory: /build/daqingest
 
diff --git a/Cargo.toml b/Cargo.toml
index 5824053..16f7b42 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,10 +3,13 @@ members = ["log", "netfetch", "daqingest"]
 resolver = "2"
 
 [profile.release]
-opt-level = 3
+opt-level = 2
 debug = 0
 overflow-checks = false
 debug-assertions = false
 lto = "thin"
 codegen-units = 64
 incremental = true
+
+[patch.crates-io]
+thiserror = { git = "https://github.com/dominikwerder/thiserror.git" }
diff --git a/dbpg/src/lib.rs b/dbpg/src/lib.rs
index 1f5fe7c..0b7eba0 100644
--- a/dbpg/src/lib.rs
+++ b/dbpg/src/lib.rs
@@ -6,5 +6,6 @@ pub mod pool;
 pub mod schema;
 pub mod seriesbychannel;
 pub mod seriesid;
+pub mod testerr;
 
 pub use tokio_postgres as postgres;
diff --git a/dbpg/src/testerr.rs b/dbpg/src/testerr.rs
new file mode 100644
index 0000000..12e9409
--- /dev/null
+++ b/dbpg/src/testerr.rs
@@ -0,0 +1,31 @@
+use err::thiserror;
+use err::ThisError;
+use std::fmt;
+
+#[derive(Debug)]
+struct TestError {
+    msg: String,
+}
+
+impl fmt::Display for TestError {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        write!(fmt, "{}", self.msg)
+    }
+}
+
+impl std::error::Error for TestError {}
+
+#[derive(Debug, ThisError)]
+enum Error {
+    Postgres(#[from] tokio_postgres::Error),
+    Dummy(#[from] TestError),
+}
+
+#[test]
+fn err_msg_01() {
+    let err: Error = TestError {
+        msg: "some-error".into(),
+    }
+    .into();
+    assert_eq!(err.to_string(), "Error::Dummy(some-error)")
+}
diff --git a/ingest-linux/Cargo.toml b/ingest-linux/Cargo.toml
index 5b9ed24..a1496f1 100644
--- a/ingest-linux/Cargo.toml
+++ b/ingest-linux/Cargo.toml
@@ -6,6 +6,6 @@ edition = "2021"
 
 [dependencies]
 libc = "0.2"
-thiserror = "1.0.47"
+thiserror = "1.0.41"
 log = { path = "../log" }
 taskrun = { path = "../../daqbuffer/crates/taskrun" }