diff --git a/Objects/unicodectype.c b/Objects/unicodectype.c
--- a/Objects/unicodectype.c
+++ b/Objects/unicodectype.c
@@ -11,6 +11,10 @@
 #include "Python.h"
 #include "unicodeobject.h"
 
+#if defined(WANT_WCTYPE_FUNCTIONS) && defined(HAVE_WCTYPE_H)
+#include <wctype.h>
+#endif
+
 #define ALPHA_MASK 0x01
 #define DECIMAL_MASK 0x02
 #define DIGIT_MASK 0x04
diff --git a/configure b/configure
--- a/configure
+++ b/configure
@@ -6654,7 +6654,7 @@
 sys/termio.h sys/time.h \
 sys/times.h sys/types.h sys/un.h sys/utsname.h sys/wait.h pty.h libutil.h \
 sys/resource.h netpacket/packet.h sysexits.h bluetooth.h \
-bluetooth/bluetooth.h linux/tipc.h spawn.h util.h alloca.h
+bluetooth/bluetooth.h linux/tipc.h spawn.h util.h alloca.h wctype.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -1519,7 +1519,7 @@
 sys/termio.h sys/time.h \
 sys/times.h sys/types.h sys/un.h sys/utsname.h sys/wait.h pty.h libutil.h \
 sys/resource.h netpacket/packet.h sysexits.h bluetooth.h \
-bluetooth/bluetooth.h linux/tipc.h spawn.h util.h alloca.h)
+bluetooth/bluetooth.h linux/tipc.h spawn.h util.h alloca.h wctype.h)
 AC_HEADER_DIRENT
 AC_HEADER_MAJOR
 
diff --git a/pyconfig.h.in b/pyconfig.h.in
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -903,6 +903,9 @@
 /* Define to 1 if you have the `wcscoll' function. */
 #undef HAVE_WCSCOLL
 
+/* Define to 1 if you have the <wctype.h> header file. */
+#undef HAVE_WCTYPE_H
+
 /* Define if tzset() actually switches the local timezone in a meaningful way.
    */
 #undef HAVE_WORKING_TZSET