slomo@DESKTOP-63UL5V9 MSYS ~/gstreamer-rs
$ cargo build --all
    Updating git repository `https://github.com/alexcrichton/pkg-config-rs`
   Compiling pkg-config v0.3.9 (https://github.com/alexcrichton/pkg-config-rs#175dd559)
   Compiling glib-sys v0.4.0 (https://github.com/gtk-rs/sys#b08fc0e1)
error: failed to run custom build command for `glib-sys v0.4.0 (https://github.com/gtk-rs/sys#b08fc0e1)`
process didn't exit successfully: `C:\msys64\home\slomo\gstreamer-rs\target\debug\build\glib-sys-7dbb58e7b49d4edd\build-script-build` (exit code: 1)
--- stderr
`"pkg-config" "--libs" "--cflags" "glib-2.0 >= 2.32"` did not exit successfully: exit code: 1
--- stderr
Package glib-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `glib-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'glib-2.0' found


warning: build failed, waiting for other jobs to finish...
error: build failed

slomo@DESKTOP-63UL5V9 MSYS ~/gstreamer-rs
$ pkg-config --libs --cflags "glib-2.0 >= 2.32"
-mms-bitfields -I/c/gstreamer/1.0/x86_64/include/glib-2.0 -I/c/gstreamer/1.0/x86_64/lib/glib-2.0/include -L/c/gstreamer/1.0/x86_64/lib -lglib-2.0 -lintl -lws2_32 -lole32 -lwinmm -lshlwapi -lintl

slomo@DESKTOP-63UL5V9 MSYS ~/gstreamer-rs
$ echo $PKG_CONFIG_PATH
/c/gstreamer/1.0/x86_64/lib/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig:/lib/pkgconfig