File fix-cflags.patch of Package libb2
--- libb2-0.98.1/configure.orig	2025-10-26 13:27:29.977396010 +0100
+++ libb2-0.98.1/configure	2025-10-26 13:31:11.324956073 +0100
@@ -12744,7 +12744,7 @@ char x[42U], fodder = 0;if (fodder > -10
 }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-  ax_cv_check_cflags___O3=yes
+  ax_cv_check_cflags___O3=no
 else
   ax_cv_check_cflags___O3=no
 fi
@@ -12754,7 +12754,7 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___O3" >&5
 $as_echo "$ax_cv_check_cflags___O3" >&6; }
 if test x"$ax_cv_check_cflags___O3" = xyes; then :
-  CFLAGS=-O3
+  #CFLAGS=-O3
 else
   :
 fi