Currently, Msys2 doesn't provide LV2 SDK. If you need to develop LV2 plugins under Microsoft Windows, you have to build by yourself.

Now, this PKGBUILD will help you out. It generates a Pacman package, making LV2 SDK portable, manageable. Better than simply running waf install.

UPDATE: Now (by 2022/4/2) Msys2 has official LV2 package. Simply install it by Pacman:

pacman -Sy
pacman -S mingw-w64-x86_64-lv2 

Thanks Alexandros Theodotou.

1. Run Msys2 MinGW64 shell.

   DO NOT USE MSYS SHELL! It uses Msys's POSIX-compatible compilers, which are incompatible with native Win32 environment.

2. Clone this repo. Make sure that you won't put other files in PKGBUILD's directory.

3. Run makepkg:

   makepkg -f

4. Finally you will get a package file naming like mingw-w64-x86_64-lv2-1.18.2-4-x86_64.pkg.tar.zst. Install it via:

   pacman -U mingw-w64-x86_64-lv2-1.18.2-4-x86_64.pkg.tar.zst

SDK will be installed into /mingw64, and LV2 bundles will be put into /opt/LV2. You may need to copy the whole /opt/LV2 into C:\Program Files\Common Files\.

• Only x86_64 is supported. Make sure that you have a 64-bit DAW or host.