Check for and set HAVE_CRYPT_H if <crypt.h> exists

include crypt.h in password.c if crypt.h does exist

src/backend/libpq/password.c

@@ -4,6 +4,9 @@
 #include <libpq/libpq.h>
 #include <string.h>
 #include <unistd.h>
+#ifdef HAVE_CRYPT
+# include <crypt.h>
+#endif
 
 int
 verify_password(char *user, char *password, Port *port, 

src/configure

@@ -2304,7 +2304,7 @@ else
 fi
 done
 
-for ac_hdr in readline.h history.h dld.h
+for ac_hdr in readline.h history.h dld.h crypt.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6

src/configure.in

@@ -127,7 +127,7 @@ dnl Checks for header files.
 AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
 AC_CHECK_HEADERS(limits.h unistd.h termios.h values.h sys/select.h)
-AC_CHECK_HEADERS(readline.h history.h dld.h)
+AC_CHECK_HEADERS(readline.h history.h dld.h crypt.h)
 
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST

src/include/config.h.in

@@ -14,6 +14,9 @@
  * The following is set using configure.  
  */
 
+/* Set to 1 if you have <crypt.h> */
+#undef HAVE_CRYPT_H
+
 /* Set to 1 if you have <termios.h> */
 #undef HAVE_TERMIOS_H