diff -U2 -r /var/lib/copr-rpmbuild/results/i2pd-git/upstream-unpacked/Source0/i2pd-openssl/libi2pd_client/Torrents.cpp /var/lib/copr-rpmbuild/results/i2pd-git/srpm-unpacked/i2pd-openssl.tar.gz-extract/i2pd-openssl/libi2pd_client/Torrents.cpp
--- /var/lib/copr-rpmbuild/results/i2pd-git/upstream-unpacked/Source0/i2pd-openssl/libi2pd_client/Torrents.cpp	2026-10-31 23:17:48.000000000 +0000
+++ /var/lib/copr-rpmbuild/results/i2pd-git/srpm-unpacked/i2pd-openssl.tar.gz-extract/i2pd-openssl/libi2pd_client/Torrents.cpp	2026-10-31 22:55:26.000000000 +0000
@@ -345,10 +345,5 @@
 	int Blocks::GetFirstMissingBlock () const
 	{
-#if (BOOST_VERSION >= 109000) // 1.90
-		size_t ind = m_Available.find_first_off ();
-#else
-		auto inv = ~m_Available;
-		size_t ind = inv.find_first ();
-#endif
+		size_t ind = m_Available.find_first ();
 		return (ind != boost::dynamic_bitset<>::npos) ? ind : -1;
 	}