--- a/lib/external/pattern_language/lib/CMakeLists.txt
+++ b/lib/external/pattern_language/lib/CMakeLists.txt
@@ -90,7 +90,7 @@
 if (CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
     target_compile_options(libpl PRIVATE /EHsc)
 elseif (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
-    target_compile_options(libpl PRIVATE -Wall -Wextra -Werror -Wpedantic -Wno-unknown-pragmas -Wno-array-bounds)
+    target_compile_options(libpl PRIVATE -Wall -Wextra -Wpedantic -Wno-unknown-pragmas -Wno-array-bounds)
     if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
         target_compile_options(libpl PRIVATE -Wno-stringop-overflow)
     endif()