diff --git a/BeefBoot/CMakeLists.txt b/BeefBoot/CMakeLists.txt
index e0a3ce14..34ee56c6 100644
--- a/BeefBoot/CMakeLists.txt
+++ b/BeefBoot/CMakeLists.txt
@@ -137,8 +137,17 @@ execute_process(
   COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/../extern/llvm_linux_13_0_1/bin/llvm-config --system-libs --link-static
   OUTPUT_VARIABLE LLVM_SYSTEM_LIBS
   OUTPUT_STRIP_TRAILING_WHITESPACE
+  RESULT_VARIABLE EXEC_RESULT
 )
 
+if (EXEC_RESULT AND NOT EXEC_RESULT EQUAL 0)
+  if (EXEC_RESULT MATCHES "^[0-9]+$")
+    message(FATAL_ERROR "llvm-config exited with code ${EXEC_RESULT}.")
+  else()
+    message(FATAL_ERROR "llvm-config couldn't be executed: ${EXEC_RESULT}")
+  endif()
+endif()
+
 if (${APPLE})
     set(TARGET_LIBS_OS "")
 else()
diff --git a/IDEHelper/CMakeLists.txt b/IDEHelper/CMakeLists.txt
index 32068a31..77366452 100644
--- a/IDEHelper/CMakeLists.txt
+++ b/IDEHelper/CMakeLists.txt
@@ -195,9 +195,18 @@ add_library(${PROJECT_NAME} SHARED
 execute_process(
   COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/../extern/llvm_linux_13_0_1/bin/llvm-config --system-libs --link-static
   OUTPUT_VARIABLE LLVM_SYSTEM_LIBS
-  OUTPUT_STRIP_TRAILING_WHITESPACE  
+  OUTPUT_STRIP_TRAILING_WHITESPACE
+  RESULT_VARIABLE EXEC_RESULT
 )
 
+if (EXEC_RESULT AND NOT EXEC_RESULT EQUAL 0)
+  if (EXEC_RESULT MATCHES "^[0-9]+$")
+    message(FATAL_ERROR "llvm-config exited with code ${EXEC_RESULT}.")
+  else()
+    message(FATAL_ERROR "llvm-config couldn't be executed: ${EXEC_RESULT}")
+  endif()
+endif()
+
 set(TARGET_LIBS_OS "${LLVM_SYSTEM_LIBS}")
 
 if (HAVE_BACKTRACE_HEADERS)