ADDITIONAL SYSTEM INFORMATION :
cygwin 3.5.3 on Windows 10

A DESCRIPTION OF THE PROBLEM :
Download and unpack openjdk, download and install openjdk 22 as "boot jdk", point JAVA_HOME to it.
Run ./configure; cygwin is apparently recognized and used to be supported before (https://bugs.openjdk.org/browse/JDK-8079087, https://bugs.openjdk.org/browse/JDK-6260866):
...
checking Windows environment type... cygwin
checking cygwin drive prefix... '/cygdrive'
checking cygwin root directory as Windows path... 'C:\cygwin64'
checking cygwin temp directory... /tmp
checking cygwin release... 3.5.3-1.x86_64
checking cygwin version... 2024-04-03 17:25 UTC
checking Windows version... 10.0.19045.4412
...
but then it refers to Visual Studio (does it really need that to build in a POSIX environment?) and fails:
configure: Found Visual Studio installation at /cygdrive/c/progra~2/micros~2/2019/BuildTools using well-known name
configure: Found Microsoft Visual Studio 2019
configure: Trying to extract Visual Studio environment variables for x86_64
configure: using /cygdrive/c/progra~2/micros~2/2019/BuildTools/vc/auxiliary/build/vcvars64.bat
Das System kann auf die Datei nicht zugreifen.
configure: Could not successfully extract the environment variables needed for the VS setup.
configure: Try setting --with-tools-dir to the VC/bin directory within the VS installation.
configure: To analyze the problem, see extract-vs-env.log and extract-vs-env.bat in
configure: /home/towo/tmp/jdk/build/windows-x86_64-server-release/configure-support/vs-env-x86_64.
configure: error: Cannot continue