diff --git a/include/grp.h b/include/grp.h
index 358181bf139a2c7f8aacd6d380fae27082d46bec..d85814093ab90c93cd9fb582897a0ee626edf74a 100644
--- a/include/grp.h
+++ b/include/grp.h
@@ -34,7 +34,7 @@ void           endgrent(void);
 void           setgrent(void);
 
 #ifdef _GNU_SOURCE
-struct group  *fgetgrent(FILE *stream);
+struct group  *fgetgrent(FILE *);
 int putgrent(const struct group *, FILE *);
 #endif
 
diff --git a/include/ifaddrs.h b/include/ifaddrs.h
index 4726db6e09387019b54dd793b9faa658875669cc..c0328a8ea510385a56fb15a8a8eba6ba90d1508c 100644
--- a/include/ifaddrs.h
+++ b/include/ifaddrs.h
@@ -24,8 +24,8 @@ struct ifaddrs {
 #define ifa_broadaddr ifa_ifu.ifu_broadaddr
 #define ifa_dstaddr ifa_ifu.ifu_dstaddr
 
-void freeifaddrs(struct ifaddrs *ifp);
-int getifaddrs(struct ifaddrs **ifap);
+void freeifaddrs(struct ifaddrs *);
+int getifaddrs(struct ifaddrs **);
 
 #ifdef __cplusplus
 }
diff --git a/include/stdlib.h b/include/stdlib.h
index d2c911fcd7a3f2954dbb8a33b76651f29657f438..42ca83363877206237bad82fa4e116984832cb10 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -39,7 +39,7 @@ void *malloc (size_t);
 void *calloc (size_t, size_t);
 void *realloc (void *, size_t);
 void free (void *);
-void *aligned_alloc(size_t alignment, size_t size);
+void *aligned_alloc(size_t, size_t);
 
 _Noreturn void abort (void);
 int atexit (void (*) (void));
diff --git a/include/sys/xattr.h b/include/sys/xattr.h
index f926493cbca804f0c53d063fedd8761a46f397a2..6479fcc62e5f36cb02b146d2c3ca8f1fcefbd260 100644
--- a/include/sys/xattr.h
+++ b/include/sys/xattr.h
@@ -13,10 +13,10 @@ extern "C" {
 
 ssize_t getxattr(const char *, const char *, void *, size_t);
 ssize_t lgetxattr(const char *, const char *, void *, size_t);
-ssize_t fgetxattr(int filedes, const char *, void *, size_t);
+ssize_t fgetxattr(int, const char *, void *, size_t);
 ssize_t listxattr(const char *, char *, size_t);
 ssize_t llistxattr(const char *, char *, size_t);
-ssize_t flistxattr(int filedes, char *, size_t);
+ssize_t flistxattr(int, char *, size_t);
 int setxattr(const char *, const char *, const void *, size_t, int);
 int lsetxattr(const char *, const char *, const void *, size_t, int);
 int fsetxattr(int, const char *, const void *, size_t, int);
diff --git a/include/threads.h b/include/threads.h
index 017948261e9f8818340c7fc789c6a4d9aff93d3c..8122b3b1df5e5a931b98eb688d227800934a126b 100644
--- a/include/threads.h
+++ b/include/threads.h
@@ -75,7 +75,7 @@ int cnd_timedwait(cnd_t *__restrict, mtx_t *__restrict, const struct timespec *_
 int cnd_wait(cnd_t *, mtx_t *);
 
 int tss_create(tss_t *, tss_dtor_t);
-void tss_delete(tss_t key);
+void tss_delete(tss_t);
 
 int tss_set(tss_t, void *);
 void *tss_get(tss_t);
diff --git a/include/wchar.h b/include/wchar.h
index 3e6db5fc604fe331f0bce6966ebe60cd33192ea8..369b1e9f25a4225e5c1a02e6e4bc49736a1e1500 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -53,7 +53,7 @@ int wcscmp (const wchar_t *, const wchar_t *);
 int wcsncmp (const wchar_t *, const wchar_t *, size_t);
 
 int wcscoll(const wchar_t *, const wchar_t *);
-size_t wcsxfrm (wchar_t *__restrict, const wchar_t *__restrict, size_t n);
+size_t wcsxfrm (wchar_t *__restrict, const wchar_t *__restrict, size_t);
 
 wchar_t *wcschr (const wchar_t *, wchar_t);
 wchar_t *wcsrchr (const wchar_t *, wchar_t);
@@ -165,7 +165,7 @@ int wcscasecmp_l(const wchar_t *, const wchar_t *, locale_t);
 int wcsncasecmp(const wchar_t *, const wchar_t *, size_t);
 int wcsncasecmp_l(const wchar_t *, const wchar_t *, size_t, locale_t);
 int wcscoll_l(const wchar_t *, const wchar_t *, locale_t);
-size_t wcsxfrm_l(wchar_t *__restrict, const wchar_t *__restrict, size_t n, locale_t);
+size_t wcsxfrm_l(wchar_t *__restrict, const wchar_t *__restrict, size_t, locale_t);
 #endif
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)