Building app-containers/conmon with a cross-compiling toolchain fails because the compiler searches the wrong PKG_CONFIG_PATH. aarch64-unknown-linux-gnu-gcc -O2 -pipe -fomit-frame-pointer -DVERSION=\"2.1.6\" -DGIT_COMMIT=\"v2.1.6\" -D USE_JOURNALD=1 -D USE_SECCOMP=1 -o src/ctr_logging.o -c src/ctr_logging.c In file included from src/conmon.c:8: src/utils.h:9:10: fatal error: glib.h: No such file or directory 9 | #include <glib.h> | ^~~~~~~~ compilation terminated. 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 Package 'glib-2.0', required by 'virtual:world', not found Fortunately, the fix for this is to simply add PKG_CONFIG to the list of environment variables to export with the `tc-export` function.