Add missing include files to avoid implicit function declarations.

diff --git a/configure b/configure
index 3dd46a982bc30af1..0fd5bd685c32f3cd 100755
--- a/configure
+++ b/configure
@@ -22292,6 +22292,7 @@ else
         cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <stdarg.h>
+	#include <stdlib.h>
         void f (int i, ...) {
         va_list args1, args2;
         va_start (args1, i);
@@ -22325,6 +22326,7 @@ else
         cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <stdarg.h>
+	#include <stdlib.h>
         void f (int i, ...) {
         va_list args1, args2;
         va_start (args1, i);
@@ -22377,6 +22379,7 @@ else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <stdarg.h>
+	#include <stdlib.h>
         void f (int i, ...) {
         va_list args1, args2;
         va_start (args1, i);
@@ -48608,6 +48611,9 @@ else
 #if HAVE_LANGINFO_CODESET
 # include <langinfo.h>
 #endif
+#if HAVE_WCTYPE_H
+# include <wctype.h>
+#endif
 #include <stdlib.h>
 #include <string.h>
 struct tm t;
diff --git a/configure.ac b/configure.ac
index eb506e7d2af0afee..e268386180b5e524 100644
--- a/configure.ac
+++ b/configure.ac
@@ -344,6 +344,7 @@ dnl all results in config.log for bug reports.
 
 AC_CACHE_CHECK([for an implementation of va_copy()],prelude_cv_va_copy,[
         AC_LINK_IFELSE([AC_LANG_SOURCE([#include <stdarg.h>
+	#include <stdlib.h>
         void f (int i, ...) {
         va_list args1, args2;
         va_start (args1, i);
@@ -361,6 +362,7 @@ AC_CACHE_CHECK([for an implementation of va_copy()],prelude_cv_va_copy,[
 ])
 AC_CACHE_CHECK([for an implementation of __va_copy()],prelude_cv___va_copy,[
         AC_LINK_IFELSE([AC_LANG_SOURCE([#include <stdarg.h>
+	#include <stdlib.h>
         void f (int i, ...) {
         va_list args1, args2;
         va_start (args1, i);
@@ -390,6 +392,7 @@ fi
 
 AC_CACHE_CHECK([whether va_lists can be copied by value],prelude_cv_va_val_copy,[
         AC_TRY_RUN([#include <stdarg.h>
+	#include <stdlib.h>
         void f (int i, ...) {
         va_list args1, args2;
         va_start (args1, i);
diff --git a/libmissing/m4/locale-tr.m4 b/libmissing/m4/locale-tr.m4
index 2f2cf47892d505a5..c2683e53b8574f6d 100644
--- a/libmissing/m4/locale-tr.m4
+++ b/libmissing/m4/locale-tr.m4
@@ -19,6 +19,9 @@ changequote(,)dnl
 #if HAVE_LANGINFO_CODESET
 # include <langinfo.h>
 #endif
+#if HAVE_WCTYPE_H
+# include <wctype.h>
+#endif
 #include <stdlib.h>
 #include <string.h>
 struct tm t;