[HELP] Cannot find 'cairo.pc' even though cairo is listed in pkg-config (windows)

[jokteur]

Hello,

I post this in gtk-rs-core, because I have successfully used cairo in the past with C++ on Windows.

I'm trying to compile a simple program in Rust and I need to use the cairo library. cairo has been successfully compiled and installed with gvsbuild, C:\gtk-build\gtk\x64\release\bin is in my PATH and PKG_CONFIG_PATH is set to C:\gtk-build\gtk\x64\release\lib\pkgconfig. If I launch the command (on a Windows terminal):

pkg-config --libs cairo
-LC:/gtk-build/gtk/x64/release/lib -lcairo

Everything is indicating that cairo is installed on my machine, and pkg-config is correctly configured. I've added cairo-rs to my Rust project like this:

[dependencies]
cairo-rs = { version = "0.18.5", features = ["svg", "png"] }

If I do cargo build, then I get the following error:

The system library `cairo` required by crate `cairo-sys-rs` was not found.
  The file `cairo.pc` needs to be installed and the PKG_CONFIG_PATH environment variable must contain its parent directory.
  PKG_CONFIG_PATH contains the following:
      - C
      - \gtk-build\gtk\x64\release\lib\pkgconfig

  HINT: you may need to install a package such as cairo, cairo-dev or cairo-devel.

However, cairo.pc exists in the pkgconfig folder, I really don't understand why cargo is unable to find cairo. Any pointers ?

Thanks