diff -U2 -r /var/lib/copr-rpmbuild/results/i2pd-git/upstream-unpacked/Source0/i2pd-openssl/libi2pd/FS.cpp /var/lib/copr-rpmbuild/results/i2pd-git/srpm-unpacked/i2pd-openssl.tar.gz-extract/i2pd-openssl/libi2pd/FS.cpp
--- /var/lib/copr-rpmbuild/results/i2pd-git/upstream-unpacked/Source0/i2pd-openssl/libi2pd/FS.cpp	2026-10-04 21:55:27.000000000 +0000
+++ /var/lib/copr-rpmbuild/results/i2pd-git/srpm-unpacked/i2pd-openssl.tar.gz-extract/i2pd-openssl/libi2pd/FS.cpp	2026-10-04 21:34:14.000000000 +0000
@@ -261,10 +261,10 @@
 		auto t = std::filesystem::last_write_time (path, ec);
 		if (ec) return 0;
-#if __cpp_lib_chrono >= 201907L // std::chrono::clock_cast
+/*#if __cplusplus >= 202002L // C++ 20 or higher
 		const auto sctp = std::chrono::clock_cast<std::chrono::system_clock>(t);
-#else
+#else	*/	// TODO: wait until implemented
 		const auto sctp = std::chrono::time_point_cast<std::chrono::system_clock::duration>(
 		    t - decltype(t)::clock::now() + std::chrono::system_clock::now());
-#endif
+/*#endif */
 		return std::chrono::system_clock::to_time_t(sctp);
 #else