diff -U2 -r /var/lib/copr-rpmbuild/results/i2pd-git/upstream-unpacked/Source0/i2pd-openssl/Makefile.linux /var/lib/copr-rpmbuild/results/i2pd-git/srpm-unpacked/i2pd-openssl.tar.gz-extract/i2pd-openssl/Makefile.linux
--- /var/lib/copr-rpmbuild/results/i2pd-git/upstream-unpacked/Source0/i2pd-openssl/Makefile.linux	2026-07-20 21:04:05.000000000 +0000
+++ /var/lib/copr-rpmbuild/results/i2pd-git/srpm-unpacked/i2pd-openssl.tar.gz-extract/i2pd-openssl/Makefile.linux	2026-07-20 20:52:46.000000000 +0000
@@ -14,7 +14,4 @@
 ifeq ($(shell expr match $(CXX) 'clang'),5)
 	NEEDED_CXXFLAGS += -std=c++20
-else ifeq ($(shell expr match ${CXXVER} "10"),2) # gcc 10
-# for Debian 11
-	NEEDED_CXXFLAGS += -std=c++17
 else ifeq ($(shell expr match ${CXXVER} "11"),2) # gcc 11
 	NEEDED_CXXFLAGS += -std=c++20
@@ -23,5 +20,5 @@
 	NEEDED_CXXFLAGS += -std=c++17 -Wno-bidi-chars
 else ifeq ($(shell expr match ${CXXVER} "13"),2) # gcc 13
-	NEEDED_CXXFLAGS += -std=c++20 -Wno-bidi-chars
+	NEEDED_CXXFLAGS += -std=c++20
 else ifeq ($(shell expr match ${CXXVER} "1[4-9]"),2) # gcc 14+
 	NEEDED_CXXFLAGS += -std=c++23 -Wno-bidi-chars