Migrated.

lib/include/string.h

@@ -22,6 +22,7 @@ char *strncpy(char *dest, const char *src, size_t maxlen);
 int strcmp(const char *s1, const char *s2);
 int strncmp(const char *s1, const char *s2, size_t n);
 char *strstr(const char *haystack, const char *needle);
+char *strchr(const char *s, int n);
 void *memcpy(void *dest, const void *src, size_t n);
 void *memcpy_long(void *dest, const void *src, size_t n);
 int memcmp(const void *s1, const void *s2, size_t n);