extern char* crypt_getpwdfilename(void);

                                  ^^^^ gcc likes this

Author: vadim4o

src/include/libpq/crypt.h

@@ -13,7 +13,7 @@
 
 #define CRYPT_PWD_FILE	"pg_pwd"
 
-extern char* crypt_getpwdfilename();
+extern char* crypt_getpwdfilename(void);
 extern MsgType crypt_salt(const char* user);
 extern int crypt_verify(Port* port, const char* user, const char* pgpass);