--- opensc-0.19.0/configure.ac~	2018-09-13 13:52:42.000000000 +0200
+++ opensc-0.19.0/configure.ac	2021-10-04 22:28:33.902587661 +0200
@@ -130,7 +130,6 @@
 	;;
 esac
 
-AX_CHECK_COMPILE_FLAG(-Wunknown-warning-option, [have_unknown_warning_option="yes"], [have_unknown_warning_option="no"], [-Werror])
 AM_CONDITIONAL([HAVE_UNKNOWN_WARNING_OPTION], [test "${have_unknown_warning_option}" = "yes"])
 
 AC_ARG_ENABLE(
@@ -1042,7 +1042,7 @@
 	CFLAGS="${CFLAGS} -pedantic"
 fi
 if test "${enable_strict}" = "yes"; then
-	CFLAGS="${CFLAGS} -Wall -Wextra -Wno-unused-parameter -Werror"
+	CFLAGS="${CFLAGS} -Wall -Wextra -Wno-unused-parameter"
 fi
 
 AC_CONFIG_FILES([
--- opensc-0.19.0/m4/ax_pthread.m4~	2018-09-13 13:52:42.000000000 +0200
+++ opensc-0.19.0/m4/ax_pthread.m4	2021-10-04 22:29:18.960949785 +0200
@@ -299,7 +299,7 @@
              ax_pthread_save_CFLAGS="$CFLAGS"
              for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
                 AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
-                CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
+                CFLAGS="-Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
                 ac_link="$ax_pthread_save_ac_link"
                 AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
                     [ac_link="$ax_pthread_2step_ac_link"