On My PC I tried to build Alire from the github repository and am experiencing issues when running the executable.

Here is a log of what I did.
Note that the currently installed Alire is alr-2.0.1-bin-x86_64-windows.zip, which works fine.

To reproduce, I built Alire from scratch (Commit: d296745):

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D:\repos>git clone --recurse-submodules https://github.com/alire-project/alire.git
Cloning into 'alire'...

D:\repos>cd alire

D:\repos\alire>alr toolchain --select
Welcome to the toolchain selection assistant

In this assistant you can set up the default toolchain to be used with any crate
that does not specify its own top-level dependency on a version of gnat or
gprbuild.

If you choose "None", Alire will use whatever version is found in the
environment.

Note: Currently configured: gnat_native=14.2.1

Please select the gnat version for use with this configuration

1. gnat_native=14.2.1
2. None
3. gnat_external=2021.0.0 [Detected at d:\GNAT\2021\bin\gnat.exe]
4. gnat_arm_elf=14.2.1
5. gnat_avr_elf=14.2.1
6. gnat_riscv64_elf=14.2.1
7. gnat_xtensa_esp32_elf=14.2.1
8. gnat_arm_elf=14.1.3
9. gnat_avr_elf=14.1.3
10. gnat_native=14.1.3
    a. (See more choices...)
    Enter your choice index (first is default):

1
Note: Selected tool version gnat_native=14.2.1

Note: Choices for the following tool are narrowed down to releases compatible with just selected gnat_native=14.2.1

Note: Currently configured: gprbuild=22.0.1

Please select the gprbuild version for use with this configuration

1. gprbuild=22.0.1
2. None
3. gprbuild=21.0.2
4. gprbuild=21.0.1
   Enter your choice index (first is default):

1
Note: Selected tool version gprbuild=22.0.1

D:\repos\alire>set ALIRE_OS=windows

D:\repos\alire>gprbuild -j0 -p -P alr_env

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When I go to a crate that worked fine before, I now get an exception:

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D:\alire\crates\cuda\cuda64>\repos\alire\bin\alr -d printenv
stderr: ADA.ASSERTIONS.ASSERTION_ERROR
stderr: Path is not absolute: C:
stderr: raised ADA.ASSERTIONS.ASSERTION_ERROR : Path is not absolute: C:
[D:\repos\alire\bin\alr.exe]
0xf86092 Semantic_Versioning.Basic.At_Least at alire.ads:352
0xb6bd23 Semantic_Versioning.Basic.At_Least at alire-platforms-current__windows.adb:91
0x83d1fb Semantic_Versioning.Basic.At_Least at alire-environment-formatting.adb:34
0x841863 Semantic_Versioning.Basic.At_Least at alire-environment-loading.adb:127
0x83fa5a Semantic_Versioning.Basic.At_Least at alire-environment-loading.adb:82
0xd4e369 Semantic_Versioning.Basic.At_Least at alire-roots.adb:300
0x4ad526 Semantic_Versioning.Basic.At_Least at alr-commands-printenv.adb:42
0x535dd7 Semantic_Versioning.Basic.At_Least at clic-subcommand-instance.adb:749
0x54384d Semantic_Versioning.Basic.At_Least at alr-commands.adb:562
0x4017b3 Alr.Main at alr-main.adb:13
0x4054ac Main at b__alr-main.adb:2427
0x401423 __tmainCRTStartup at ???
0x40113b mainCRTStartup at ???
[C:\WINDOWS\System32\KERNEL32.DLL]
0x7ffe9e9e257b
[C:\WINDOWS\SYSTEM32\ntdll.dll]
0x7ffe9f8caf26

ERROR: Path is not absolute: C:
ERROR: alr encountered an unexpected error, re-run with -d for details.
ERROR: error location: 0xf86092 Semantic_Versioning.Basic.At_Least at alire.ads:352

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Running the 'old' Alire 2.0.1 I get:

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D:\alire\crates\cuda\cuda64>alr -d printenv
export ALIRE="True"
export CUDA64_ALIRE_PREFIX="D:\alire\crates\cuda\cuda64"
export GNAT_NATIVE_ALIRE_PREFIX="C:\Users\veenk\AppData\Local\alire\cache\toolchains\gnat_native_14.2.1_2540cccb"
export GPRBUILD_ALIRE_PREFIX="C:\Users\veenk\AppData\Local\alire\cache\toolchains\gprbuild_22.0.1_c842bbc5"
export GPR_PROJECT_PATH=
(no issues)

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The Alire settings are:

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D:\alire\crates\cuda\cuda64>alr settings --global
last_build_profile=cuda64=DEVELOPMENT
toolchain.external.gprbuild=false
msys2.do_not_install=true
editor.cmd=gnatstudio -P ${GPR_FILE}
index.last_update=226394249
toolchain.assistant=false
index.auto_update_asked=true
toolchain.use.gnat=gnat_native=14.2.1
toolchain.use.gprbuild=gprbuild=22.0.1
toolchain.external.gnat=false

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For this crate the alire.toml is:

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name = "cuda64"
version = "10.2.0"
description = "CUDA runtime libraries"
long-description = """
This crate contains NVidia CUDA support libraries."
"""
authors = "veenker@xs4all.nl"
maintainers = ["veenker@xs4all.nl"]
maintainers-logins = ["rveenker",]

project-files = []