error: cannot check for file existence when cross compiling

[autra]

Description

When cross-compiling, the following error is shown during configuration:

> checking for .git... configure: error: cannot check for file existence when cross compiling

And indeed, the configure step has this line:

AC_CHECK_FILE([.git], [DOTGITDIR=yes], [DOTGITDIR=no])

Which is apparently not supported when cross-compiling.

Possible solution

The test command does work in a cross-compiling context, so I suggest to actually test the file existence in the following if. I can submit a MR if this is ok.

Steps

I'm using the nix builtin support for cross-compilation, so my steps are:

• clone https://github.com/autra/nixpkgs
• checkout branch postgresql_pgpointcloud
• run nix build -L .#pkgsCross.aarch64-multiplatform.postgresqlPackages.pointcloud --cores 8

I don't really know how to do it directly.