--- clang-14.log	2022-11-02 22:36:18.517746061 +1100
+++ clang-15.log	2022-11-02 22:36:18.518746058 +1100
@@ -3,19 +3,17 @@
 
 
 
-./conf43-21-1.c:1:13: warning: call to undeclared function 'pthread_create'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
+./conf43-21-1.c:1:13: error: call to undeclared function 'pthread_create'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
 int main(){ pthread_create(0, 0, (void*(*)(void*))0, 0); ;}
             ^
 /usr/bin/x86_64-pc-linux-gnu-ld: cannot find -ll: No such file or directory
-clang-15: error: linker command failed with exit code 1 (use -v to see invocation)
+clang-14: error: linker command failed with exit code 1 (use -v to see invocation)
 /usr/bin/x86_64-pc-linux-gnu-ld: cannot find -ly: No such file or directory
-clang-15: error: linker command failed with exit code 1 (use -v to see invocation)
-./conf43-21-1.c:1:13: warning: call to undeclared function 'listen'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
+clang-14: error: linker command failed with exit code 1 (use -v to see invocation)
+./conf43-21-1.c:1:13: error: call to undeclared function 'listen'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
 int main(){ listen(0, 0); ;}
             ^
-/usr/bin/x86_64-pc-linux-gnu-ld: cannot find -lxnet: No such file or directory
-clang-15: error: linker command failed with exit code 1 (use -v to see invocation)
-./conf43-21-1.c:1:13: warning: call to undeclared function 'dlclose'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
+./conf43-21-1.c:1:13: error: call to undeclared function 'dlclose'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
 int main(){ dlclose(0); ;}
             ^