Rather, the error was somewhat misleading. The real problem was that the gir file has not been built properly, and so the build failed on older versions, where g-ir-scanner did not support the --identifier-prefix option.
Rather, the error was somewhat misleading. The real problem was that the gir file has not been built properly, and so the build failed on older versions, where g-ir-scanner did not support the --identifier-prefix option.