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	2026-03-09 21:14:10.000000000 +0000
+++ /var/lib/copr-rpmbuild/results/i2pd-git/srpm-unpacked/i2pd-openssl.tar.gz-extract/i2pd-openssl/Makefile.linux	2026-03-09 21:02:17.000000000 +0000
@@ -14,5 +14,5 @@
 ifeq ($(shell expr match $(CXX) 'clang'),5)
 	NEEDED_CXXFLAGS += -std=c++20
-else ifeq ($(shell expr match ${CXXVER} "10"),2) # gcc 10
+else ifeq ($(shell expr match ${CXXVER} "10]"),2) # gcc 10
 	NEEDED_CXXFLAGS += -std=c++17
 else ifeq ($(shell expr match ${CXXVER} "1[1-9]"),2) # gcc 11+