diff --git a/libc/cmake/modules/LLVMLibCTestRules.cmake b/libc/cmake/modules/LLVMLibCTestRules.cmake
--- a/libc/cmake/modules/LLVMLibCTestRules.cmake
+++ b/libc/cmake/modules/LLVMLibCTestRules.cmake
@@ -173,6 +173,11 @@
   add_dependencies(exhaustive-check-libc ${suite_name})
 endfunction(add_libc_exhaustive_testsuite)
 
+function(add_libc_long_running_testsuite suite_name)
+  add_custom_target(${suite_name})
+  add_dependencies(libc-long-running-tests ${suite_name})
+endfunction(add_libc_long_running_testsuite)
+
 # Rule to add a fuzzer test.
 # Usage
 #    add_libc_fuzzer(
diff --git a/libc/test/CMakeLists.txt b/libc/test/CMakeLists.txt
--- a/libc/test/CMakeLists.txt
+++ b/libc/test/CMakeLists.txt
@@ -9,6 +9,7 @@
 add_dependencies(check-libc check-llvmlibc)
 
 add_custom_target(exhaustive-check-libc)
+add_custom_target(libc-long-running-tests)
 
 add_subdirectory(src)
 add_subdirectory(utils)