-char const abcde[] = "abcde";
-char const abcdx[] = "abcdx";
-char const * teststring = "1234567890\nABCDEFGHIJKLMNOPQRSTUVWXYZ\nabcdefghijklmnopqrstuvwxyz\n";
+/* Some strings used for <string.h> and <stdlib.h> testing. */
+static char const abcde[] = "abcde";
+static char const abcdx[] = "abcdx";
+static char const teststring[] = "1234567890\nABCDEFGHIJKLMNOPQRSTUVWXYZ\nabcdefghijklmnopqrstuvwxyz\n";