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<td class='lines'><pre><code>Slightly modified version of
https://gitlab.haskell.org/ghc/ghc/-/issues/19029#note_447989, required
for older, buggy glibc versions &lt; 2.34.

diff -Naur ghc-9.2.5/compiler/GHC/Linker/Unit.hs ghc-9.2.5.patched/compiler/GHC/Linker/Unit.hs
--- ghc-9.2.5/compiler/GHC/Linker/Unit.hs	2022-11-06 20:40:29.000000000 +0100
+++ ghc-9.2.5.patched/compiler/GHC/Linker/Unit.hs	2023-01-15 14:52:57.511275338 +0100
@@ -31,11 +31,26 @@
     ps &lt;- mayThrowUnitErr $ preloadUnitsInfo' unit_env pkgs
     return (collectLinkOpts dflags ps)
 
+fixOrderLinkOpts :: [String] -&gt; [String]
+fixOrderLinkOpts opts
+  | have_bad_glibc_version -- glibc version strictly less than 2.34
+  , let (before, rest) = break (== libc) opts
+  , not (pthread `elem` before)
+  , pthread `elem` rest -- optional if we know pthread is definitely present
+  = before ++ pthread_and_deps ++ rest
+  | otherwise
+  = opts
+  where
+    pthread = "-lpthread"
+    libc = "-lc"
+    pthread_and_deps = [ "-lrt", pthread ] -- should depend on the environment
+    have_bad_glibc_version = True
+
 collectLinkOpts :: DynFlags -&gt; [UnitInfo] -&gt; ([String], [String], [String])
 collectLinkOpts dflags ps =
     (
         concatMap (map ("-l" ++) . unitHsLibs (ghcNameVersion dflags) (ways dflags)) ps,
-        concatMap (map ("-l" ++) . map ST.unpack . unitExtDepLibsSys) ps,
+        fixOrderLinkOpts $ concatMap (map ("-l" ++) . map ST.unpack . unitExtDepLibsSys) ps,
         concatMap (map ST.unpack . unitLinkerOptions) ps
     )
 
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