diff --git a/Makefile b/Makefile
index d639d0a6..86cd9445 100644
--- a/Makefile
+++ b/Makefile
@@ -18,9 +18,6 @@
 # This Makefile is just a handy wrapper around cmake
 #
 
-# Specify preferred LLVM version for CMake
-LLVM_VERSION ?= 11
-
 .DEFAULT_GOAL := debug
 
 .PHONY: clean
@@ -30,14 +27,12 @@ clean:
 debug/CMakeLists.txt:
 	cmake -S . -B debug \
 		-DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
-		-DCMAKE_BUILD_TYPE=Debug \
-		-DLIBCLANG_LLVM_CONFIG_EXECUTABLE=/usr/bin/llvm-config-${LLVM_VERSION}
+		-DCMAKE_BUILD_TYPE=Debug
 
 release/CMakeLists.txt:
 	cmake -S . -B release \
 		-DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
-		-DCMAKE_BUILD_TYPE=Release \
-		-DLIBCLANG_LLVM_CONFIG_EXECUTABLE=/usr/bin/llvm-config-${LLVM_VERSION}
+		-DCMAKE_BUILD_TYPE=Release
 
 debug: debug/CMakeLists.txt
 	make -C debug -j
diff --git a/cmake/FindLibClang.cmake b/cmake/FindLibClang.cmake
index 46efae30..670c8616 100644
--- a/cmake/FindLibClang.cmake
+++ b/cmake/FindLibClang.cmake
@@ -57,7 +57,7 @@ if (NOT LIBCLANG_LLVM_CONFIG_EXECUTABLE)
             find_program(LIBCLANG_LLVM_CONFIG_EXECUTABLE NAMES llvm-config PATHS "${BREW_LLVM_PATH}/bin")
         else ()
             set(llvm_config_names llvm-config)
-            foreach(major RANGE 11 3)
+            foreach(major RANGE 12 3)
                 list(APPEND llvm_config_names "llvm-config${major}" "llvm-config-${major}")
                 foreach(minor RANGE 9 0)
                     list(APPEND llvm_config_names "llvm-config${major}${minor}" "llvm-config-${major}.${minor}" "llvm-config-mp-${major}.${minor}")
diff --git a/tests/t00003/t00003.cc b/tests/t00003/t00003.cc
index bc9b3f6e..b63fd7bb 100644
--- a/tests/t00003/t00003.cc
+++ b/tests/t00003/t00003.cc
@@ -1,4 +1,5 @@
 #include <functional>
+#include <string>
 
 namespace clanguml {
 namespace t00003 {