Based on upstream commit:
https://github.com/rizinorg/rizin/pull/5414/commits/191a24dcbef9a8336a930926a102d0f544b8a503
From: Zephyr Lykos <self@mochaa.ws>
Date: Sun, 28 Sep 2025 13:11:33 +0800
Subject: [PATCH] Add option to use system BLAKE3 (#5414)

--- a/doc/PACKAGERS.md
+++ b/doc/PACKAGERS.md
@@ -82,6 +82,7 @@
 * `use_sys_pcre2`
 * `use_sys_tree_sitter`
 * `use_sys_softfloat`
+* `use_sys_blake3`
 
 See [meson_options.txt][] for a complete list of compile-time options.
 
--- a/meson.build
+++ b/meson.build
@@ -310,8 +310,11 @@ libdemangle_proj = subproject('libdemangle', default_options: libdemangle_option
 libdemangle_dep = libdemangle_proj.get_variable('libdemangle_dep')
 
 # handle blake3 algo
-blake3_proj = subproject('blake3', default_options: ['default_library=static', 'werror=false'])
-blake3_dep = blake3_proj.get_variable('blake3_dep')
+blake3_dep = dependency('libblake3', required: get_option('use_sys_blake3'), static: is_static_build)
+if not blake3_dep.found()
+  blake3_proj = subproject('blake3', default_options: ['default_library=static', 'werror=false'])
+  blake3_dep = blake3_proj.get_variable('blake3_dep')
+endif
 
 # handle openssl library
 sys_openssl = dependency('openssl', required: get_option('use_sys_openssl'), static: is_static_build)
@@ -842,6 +845,7 @@ summary({
   'System zlib library': zlib_dep.found() and zlib_dep.type_name() != 'internal',
   'System zstd library': libzstd_dep.found() and libzstd_dep.type_name() != 'internal',
   'System zip library': libzip_dep.found() and libzip_dep.type_name() != 'internal',
+  'System blake3 library': blake3_dep.found() and blake3_dep.type_name() != 'internal',
   'Use ptrace-wrap': use_ptrace_wrap,
   'Use RPATH': rpath_summary,
 }, section: 'Configuration', bool_yn: true)
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -37,6 +37,7 @@
 option('use_sys_tree_sitter', type: 'feature', value: 'disabled')
 option('use_sys_pcre2', type: 'feature', value: 'disabled')
 option('use_sys_softfloat', type: 'feature', value: 'disabled')
+option('use_sys_blake3', type: 'feature', value: 'disabled')
 option('use_swift_demangler', type: 'boolean', value: true, description: 'If false, disables the swift demangler')
 option('use_gpl', type: 'boolean', value: true, description: 'Set to false when you want to disable gpl code')
 option('install_sigdb', type: 'boolean', value: false, description: 'Downloads and installs rizin sigdb')