--- clang-14.log	2022-11-02 22:36:11.850767595 +1100
+++ clang-15.log	2022-11-02 22:36:11.850767595 +1100
@@ -0,0 +1,26 @@
+config.c:8:18: warning: '/*' within block comment [-Wcomment]
+/*#define DEBUG         /* Provides extra debugging info */
+                        ^
+config.c:17:5: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
+int exists(dir, file)
+    ^
+config.c:32:1: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Werror,-Wimplicit-int]
+main(argc, argv)
+^
+int
+config.c:116:7: error: call to undeclared function 'grep'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
+        if ( grep(INCLUDE, "utmp.h", "ut_host") ) {
+             ^
+config.c:176:8: error: call to undeclared function 'access'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
+        if ( (access("/var/run/utmp", (R_OK|W_OK)) == 0) && getuid() )
+              ^
+config.c:176:54: error: call to undeclared function 'getuid'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
+        if ( (access("/var/run/utmp", (R_OK|W_OK)) == 0) && getuid() )
+                                                            ^
+config.c:32:1: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
+main(argc, argv)
+^
+config.c:257:5: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
+int grep(dir, file, word)
+    ^
+4 warnings and 4 errors generated.