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Date: Sun, 9 Aug 2026 11:01:47 +0200
From: Sebastian Ramacher &lt;sramacher@debian.org&gt;
To: Debian Bug Tracking System &lt;submit@bugs.debian.org&gt;
Subject: hkl: FTBFS: undefined reference to `H5Iregister_type'
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Source: hkl
Version: 5.1.9-1
Severity: serious
Tags: ftbfs
Justification: fails to build from source (but built successfully in the past)
X-Debbugs-Cc: sramacher@debian.org

Dear maintainer,

hkl fails to build:

[2 of 2] Linking /build/reproducible-path/hkl-5.1.9/binoculars-ng/dist-newstyle/build/x86_64-linux/ghc-9.10.3/hkl-0.1.0.2/x/binoculars-ng/build/binoculars-ng/binoculars-ng
/usr/bin/x86_64-linux-gnu-ld.bfd: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-9.10.3-inplace/hdf5-1.8.15-2h6c12wJd1gJ8Hyb8VrAtX/libHShdf5-1.8.15-2h6c12wJd1gJ8Hyb8VrAtX.a(Datatype.o): in function `hdf5zm1zi8zi15zm2h6c12wJd1gJ8Hyb8VrAtX_BindingsziHDF5ziDatatype_getTypeCreationPList_info':
(.text+0xae8b): undefined reference to `H5Tdecode'
/usr/bin/x86_64-linux-gnu-ld.bfd: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-9.10.3-inplace/hdf5-1.8.15-2h6c12wJd1gJ8Hyb8VrAtX/libHShdf5-1.8.15-2h6c12wJd1gJ8Hyb8VrAtX.a(H5I.o): in function `hdf5zm1zi8zi15zm2h6c12wJd1gJ8Hyb8VrAtX_BindingsziHDF5ziRawziH5I_h5izuregisterzutype_info':
(.text+0x150f): undefined reference to `H5Iregister_type'
/usr/bin/x86_64-linux-gnu-ld.bfd: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-9.10.3-inplace/hdf5-1.8.15-2h6c12wJd1gJ8Hyb8VrAtX/libHShdf5-1.8.15-2h6c12wJd1gJ8Hyb8VrAtX.a(H5I.o):(.data+0x4c0): undefined reference to `H5Iregister_type'
/usr/bin/x86_64-linux-gnu-ld.bfd: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-9.10.3-inplace/hdf5-1.8.15-2h6c12wJd1gJ8Hyb8VrAtX/libHShdf5-1.8.15-2h6c12wJd1gJ8Hyb8VrAtX.a(H5T.o): in function `hdf5zm1zi8zi15zm2h6c12wJd1gJ8Hyb8VrAtX_BindingsziHDF5ziRawziH5T_h5tzudecode_info':
(.text+0x12432): undefined reference to `H5Tdecode'
/usr/bin/x86_64-linux-gnu-ld.bfd: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-9.10.3-inplace/hdf5-1.8.15-2h6c12wJd1gJ8Hyb8VrAtX/libHShdf5-1.8.15-2h6c12wJd1gJ8Hyb8VrAtX.a(H5T.o):(.data+0x2d40): undefined reference to `H5Tdecode'
collect2: error: ld returned 1 exit status
ghc-9.10.3: `x86_64-linux-gnu-gcc' failed in phase `Linker'. (Exit code: 1)
HasCallStack backtrace:
  collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:169:13 in ghc-internal:GHC.Internal.Exception
  toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/IO.hs:260:11 in ghc-internal:GHC.Internal.IO
  throwIO, called at libraries/exceptions/src/Control/Monad/Catch.hs:308:12 in exceptions-0.10.9-inplace:Control.Monad.Catch
  throwM, called at libraries/exceptions/src/Control/Monad/Catch.hs:797:84 in exceptions-0.10.9-inplace:Control.Monad.Catch
  onException, called at compiler/GHC/Driver/Make.hs:2983:23 in ghc-9.10.3-inplace:GHC.Driver.Make


Error: [Cabal-7125]
Failed to build exe:binoculars-ng from hkl-0.1.0.2.

make[4]: *** [Makefile:1483: binoculars-ng] Error 1

See
https://buildd.debian.org/status/fetch.php?pkg=hkl&amp;arch=amd64&amp;ver=5.1.9-1%2Bb1&amp;stamp=1786094902&amp;raw=0
for more details.

Cheers
-- 
Sebastian Ramacher
]