diff '--color=auto' -Naur a/configure.in b/configure.in
--- a/configure.in	2019-01-09 10:54:13.000000000 +0100
+++ b/configure.in	2025-07-01 03:29:02.099836863 +0200
@@ -285,20 +285,10 @@
     ;;
 esac
 
-dnl activate some gcc specific optimizations for gcc >= 4
-if test "$GCC" = "yes"; then
-  case $host_alias in
-  *darwin*)
-    GCC_MAJOR_VERSION=`$CC -dumpversion | /usr/bin/sed -nE '1s/([[0-9]]+)\.[[0-9]]+\..*/\1/;1p'`
-    ;;
-  *)
-    GCC_MAJOR_VERSION=`$CC --version | $SED -n '1s/[[^0-9]]*//;1s/\..*//;1p'`
-    ;;
-  esac
-  if test $GCC_MAJOR_VERSION -ge 4; then
-    CFLAGS="$CFLAGS -fvisibility=hidden"
-  fi
-fi
+dnl Mark symbols hidden by default if the compiler (for example, gcc >= 4)
+dnl supports it. This can help reduce the binary size and startup time.
+AX_CHECK_COMPILE_FLAG([-fvisibility=hidden],
+                       [CFLAGS="$CFLAGS -fvisibility=hidden"])
 
 case $host_alias in
   *solaris*)