I’m looking for help in resolving this error:

``` $ stack install pandoc-cli Error: [S-4804] Stack failed to construct a build plan.

While constructing the build plan, Stack encountered the following errors:

In the dependencies for pandoc-cli-0.1.1.1: hslua-cli must match >=1.4.1 && <1.5, but the Stack configuration has no specified version (latest matching version is 1.4.1) pandoc-lua-engine must match >=0.2 && <0.3, but the Stack configuration has no specified version (latest matching version is 0.2.1.1) pandoc-server must match >=0.1 && <0.2, but the Stack configuration has no specified version (latest matching version is 0.1.0.2) needed since pandoc-cli is a build target. ```

Clearly, stack is having issues understanding version numbers. Best I can tell, stack has the pieces to form a build plan but its logic for building a plan is broken.

I installed stack via curl -sSL https://get.haskellstack.org/ | sh, as described in the documentation. The only clue that something went wrong when installing stack was the message:

``` $ stack setup … Using the latest snapshot lts-21.7. … Downloaded ghc-tinfo6-9.4.5 ar conftest.a: No such file or directory Installed GHC. …

$ echo $? # verify success—should be 0 0

```

I tried this on two systems and got the same error. I also tried compiling stack from GitHub source—that didn’t help.

I am not well-versed in the Haskell ecosystem would appreciate some pointers on how to resolve this issue. Or pointers on where to get help.

And apologies if this off-topic for this group. Just let me know.

Thanks!