repo: use system re2

CMakeLists.txt

@@ -29,13 +29,12 @@ add_compile_definitions(CHECKPOINT_VERSION="${CHECKPOINT_VERSION}")
 
 find_package(PkgConfig REQUIRED)
 
-pkg_check_modules(deps IMPORTED_TARGET openssl)
+pkg_check_modules(deps IMPORTED_TARGET openssl re2)
 
 target_include_directories(checkpoint
 PRIVATE
    "./subprojects/pistache/include"
    "./subprojects/glaze/include"
-   "./subprojects/re2"
    "./subprojects/tinylates/include"
    "./subprojects/pistache/subprojects/cpp-httplib"
    "./subprojects/pistache/subprojects/hinnant-date/include"
@@ -44,6 +43,5 @@ target_link_libraries(checkpoint
     PkgConfig::deps
     pistache
     fmt
-    re2
     tinylates
 )

README.md

@@ -26,7 +26,7 @@ If you are using this, it's almost certain search engines will stop indexing you
 
 ## Setup guide
 
-1. Clone and build this repo. You will need `openssl`, `g++>=12`, and deps for `pistache`, `fmt` and `tinylates`.
+1. Clone and build this repo. You will need `openssl`, `g++>=12`, `re2`, and deps for `pistache`, `fmt` and `tinylates`.
 2. Create a `config.jsonc`. An example one is in `example/`.
 3. Adjust the config to your needs. Options are documented with comments in the example config.
 4. Set up your IP rules if you want. These allow you to set up IPs that are automatically blocked, or allowed to access without a challenge. This is useful for e.g. search engine scrapers. Some IP ranges can be found in `example/index_bots.jsonc`.