--- ckcdeb.h

+++ ckcdeb.h

@@ -1385,10 +1385,8 @@

 #endif /* NOPRINTFSUBST */

 #ifdef CKXPRINTF

-#define printf ckxprintf

-#define fprintf ckxfprintf

 #ifdef CK_ANSIC

-_PROTOTYP(int ckxprintf,(const char *, ...));

+_PROTOTYP(int ckxprintf,(const char *, ...) __attribute__ ((format (printf, 1, 2))));

 #ifdef NEXT

 _PROTOTYP(void ckxperror,(const char *));

 #else

@@ -1398,8 +1396,16 @@

 _PROTOTYP(int ckxperror,(const char *));

 #endif /* CK_SCOV5 */

 #endif /* NEXT */

-_PROTOTYP(int ckxfprintf,(FILE *, const char *, ...));

+_PROTOTYP(int ckxfprintf,(FILE *, const char *, ...) __attribute__ ((format (printf, 2, 3))));

 #endif /* CK_ANSIC */

+#ifdef printf

+#undef printf

+#endif

+#define printf ckxprintf

+#ifdef fprintf

+#undef fprintf

+#endif

+#define fprintf ckxfprintf

 #ifdef putchar

 #undef putchar

 #endif /* putchar */

--- ckcfns.c

+++ ckcfns.c

@@ -93,7 +93,7 @@

 #endif /* OS2ONLY */

 #endif /* OS2 */

-#ifdef VMS

+#if defined VMS || defined __linux__

 #include <errno.h>

 #endif /* VMS */

--- ckcnet.c

+++ ckcnet.c

@@ -173,6 +173,10 @@

 #endif /* CK_SOCKS5 */

 #endif /* CK_SOCKS */

+#ifdef __linux__

+#include <time.h>

+#endif

+

 #ifdef DEC_TCPIP

 #include <time.h>

 #include <inet.h>

--- ckufio.c

+++ ckufio.c

@@ -501,6 +501,10 @@

 _PROTOTYP( VOID ignorsigs, (void) );

 _PROTOTYP( VOID restorsigs, (void) );

+#ifdef __linux__

+#include <crypt.h>

+#endif

+

 /*

   Change argument to "(const char *)" if this causes trouble.

   Or... if it causes trouble, then maybe it was already declared

--- ckuus4.c

+++ ckuus4.c

@@ -34,8 +34,10 @@

 #include "ck_ssl.h"

 #endif /* CK_SSL */

-#ifdef VMS

+#if defined VMS || defined __linux__

 #include <errno.h>                      /* For \v(errno) */

+#endif

+#ifdef VMS

 extern char * ckvmserrstr(unsigned long);

 #ifndef OLD_VMS

 #include <lib$routines.h>               /* Not for VAX C 2.4 */

--- ckuus5.c

+++ ckuus5.c

@@ -22,7 +22,9 @@

 */

 /* Includes */

-

+#ifdef __linux__

+#include <errno.h>

+#endif

 #include "ckcdeb.h"

 #include "ckcasc.h"

 #include "ckcker.h"

--- ckuus6.c

+++ ckuus6.c

@@ -31,6 +31,9 @@

 #include <errno.h>

 #endif /* TCPSOCKET */

 #endif /* VMS */

+#ifdef __linux__

+#include <errno.h>

+#endif

 #ifdef datageneral

 #define fgets(stringbuf,max,fd) dg_fgets(stringbuf,max,fd)

--- ckuus7.c

+++ ckuus7.c

@@ -37,6 +37,9 @@

 #include <errno.h>

 #endif /* TCPSOCKET */

 #endif /* VMS */

+#ifdef __linux__

+#include <errno.h>

+#endif

 #ifdef OS2

 #ifndef NT

--- ckuusr.c

+++ ckuusr.c

@@ -87,6 +87,10 @@

 #define MULTINET_OLD_STYLE		/* Leave select prototype undefined */

 #endif /* MULTINET */

+#ifdef __linux__

+#include <errno.h>

+#endif

+

 #include "ckcdeb.h"

 #include "ckcasc.h"

 #include "ckcker.h"

--- ckuusx.c

+++ ckuusx.c

@@ -67,13 +67,13 @@

 _PROTOTYP(char * os2_gethostname, (void));

 #define getpid _getpid

 #endif /* OS2 */

-#ifdef BSD44

+#if defined BSD44 || __linux__

 #include <errno.h>

 #endif /* BSD44 */

 extern xx_strp xxstring;

-#ifdef OS2

+#if defined  OS2 || __linux__

 #include "ckcnet.h"

 #else /* OS2 */

 _PROTOTYP(int getlocalipaddr, (void));