Files
dcr/docs/faq.mdx
Dexoron 54653dfd80 feat: add download mirrors and drop legacy install scripts
Introduce `--mirror` and `DCRUP_MIRROR` so `dcrup` can fetch prebuilt
binaries from multiple CDNs. Default `auto` tries cf → gh → sf → ya
and uses the first successful download.

- dcrup.sh / dcrup.ps1: mirror chain, CLI flag, env override
- remove install.sh / install.ps1 / install_bsd.sh (superseded by dcrup)
- GitHub Actions: upload releases to Cloudflare R2 next to Yandex S3
- docs: README, FAQ, changelog, installation, env vars, contributing
2026-08-13 12:59:12 +08:00

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---
sidebar_label: FAQ
---
# FAQ
## Registry not found
```
error: registry not found
```
**Solution:** Make sure `~/.dcr/config.toml` exists:
```toml
[registry.default]
url = "https://index.dcr.pm"
priority = 1
```
And check `DCR_INDEX_PATH`:
```bash
echo $DCR_INDEX_PATH
```
## Compiler not found
```
error: compiler not found
```
**Solution:** Ensure a compiler is installed and available in PATH.
```bash
which gcc
which clang
```
Or specify explicitly via `[toolchain]` in `dcr.toml`.
## Ctrl+C during build
DCR handles SIGINT: interrupts the current compilation and exits with non-zero code.
## How to create a library?
See [Library Recipe](/docs/recipes/library-project).
## How to cross-compile to Windows?
See [Cross-Compile Recipe](/docs/recipes/cross-to-windows).
## How to create a multi-package project?
See [Workspace Recipe](/docs/recipes/multi-package-workspace).
## Bootloader / pure NASM OS image
Use `kind = "flat-bin"` (NASM `-f bin`) and optional `[archive]` for a FAT disk image.
See [OS-dev recipe](/docs/recipes/os-flat-bin-archive).
## How do I choose a download mirror?
`dcrup install` uses `--mirror auto` by default and tries **cf → gh → sf → ya**.
```bash
dcrup install stable --mirror cf
export DCRUP_MIRROR=ya
```
## Lock file
`dcr.lock` is created during builds (`dcr build`) when registry dependencies are present. To force an update — delete `dcr.lock` and run `dcr build`.