ghc-pkg: library "libncursesw.so.6" not found

[Meowcolm024]

Problem description

The unstable package ghc (8.10.1) is installed via apt install, and I have installed llvm beforehand. ghc-pkg doesn't work as expected and throws an exception for missing file.

Steps to reproduce

1. install ghc using apt install

➜  ~ apt install ghc --fix-missing

2. run ghc-pkg

➜  ~ ghc-pkg
CANNOT LINK EXECUTABLE "/data/data/com.termux/files/usr/lib/ghc-8.10.1/bin/ghc-pkg": library "libncursesw.so.6" not found: needed by main executable

Expected behavior

For just running ghc-pkg the expected output should be: (On macOS 11.0.1 x86_64, version 8.8.4)

➜  ~ ghc-pkg
ghc-pkg: missing command
For usage information see 'ghc-pkg --help'.

Additional information

The error output

➜  ~ ghc-pkg
CANNOT LINK EXECUTABLE "/data/data/com.termux/files/usr/lib/ghc-8.10.1/bin/ghc-pkg": library "libncursesw.so.6" not found: needed by main executable

Other info:

Device: Oneplus 8 Pro (Snapdragon 865) 
OS: Android 11, Hydrogen OS 11.0.1.1IN11 (NOT rooted)
Termux version: 0.101

[HamzaMateen]

I just ran into the same issue :(

[vestineo]

You can do any of the two things. Either

1. LD_LIBRARY_PATH=$PREFIX/lib/ ghc-pkg
   Or patch elf
2. patchelf --set-rpath $PREFIX/lib/ $PREFIX/lib/ghc-8.10.1/bin/ghc-pkg

[danwdart]

ghc seems missing from the unstable repo.

[chenyulue]

@vestineo 's first suggestion solved the linking issue.

However, ghc-pkg list gives a segmentation fault, which I don'tn know why happens.