diff --git a/src/bpt/makeBpt.c b/src/bpt/makeBpt.c
index 487319e75..a6ca74974 100644
--- a/src/bpt/makeBpt.c
+++ b/src/bpt/makeBpt.c
@@ -76,9 +76,7 @@ static void errExit(char *pmessage)
     exit(-1);
 }
 
-int main(argc, argv)
-    int             argc;
-    char          **argv;
+int main(int argc, char **argv)
 {
     char	*pbeg;
     char	*pend;
diff --git a/src/ca/acctst.c b/src/ca/acctst.c
index 8e3eecbc6..da009c5e0 100644
--- a/src/ca/acctst.c
+++ b/src/ca/acctst.c
@@ -2018,7 +2018,7 @@ void caTaskExitTest ( unsigned interestLevel )
     showProgressEnd ( interestLevel );
 }
 
-void verifyDataTypeMacros ()
+void verifyDataTypeMacros (void)
 {
     int type;
 
diff --git a/src/db/dbScan.c b/src/db/dbScan.c
index 96f64224c..5a372d6a9 100644
--- a/src/db/dbScan.c
+++ b/src/db/dbScan.c
@@ -153,7 +153,7 @@ static void scanShutdown(void *arg)
     epicsEventWait(startStopEvent);
 }
 
-long scanInit()
+long scanInit(void)
 {
     int i;
 
@@ -392,7 +392,7 @@ int scanpel(int event_number)   /* print event list */
     return 0;
 }
 
-int scanpiol()                  /* print io_event list */
+int scanpiol(void)                  /* print io_event list */
 {
     io_scan_list *piosl;
     int prio;
@@ -562,7 +562,7 @@ static void periodicTask(void *arg)
 }
 
 
-static void initPeriodic()
+static void initPeriodic(void)
 {
     dbMenu *pmenu;
     periodic_scan_list *ppsl;
diff --git a/src/db/dbTest.h b/src/db/dbTest.h
index 0ed19819e..231403a62 100644
--- a/src/db/dbTest.h
+++ b/src/db/dbTest.h
@@ -43,7 +43,7 @@ epicsShareFunc long epicsShareAPI dbtpf(const char *pname,const char *pvalue);
 epicsShareFunc long epicsShareAPI dbior(
     const char *pdrvName,int interest_level);
 /*Hardware Configuration Report*/
-epicsShareFunc int epicsShareAPI dbhcr();
+epicsShareFunc int epicsShareAPI dbhcr(void);
 
 #ifdef __cplusplus
 }
diff --git a/src/dbStatic/dbExpand.c b/src/dbStatic/dbExpand.c
index 8a8316185..80c95cabd 100644
--- a/src/dbStatic/dbExpand.c
+++ b/src/dbStatic/dbExpand.c
@@ -26,7 +26,7 @@
 
 DBBASE *pdbbase = NULL;
 
-void usage() 
+void usage(void)
 {
     fprintf(stderr, "Usage:\n\tdbExpand -Ipath -ooutfile "
 	    "-S macro=value file1.dbd file2.dbd ...\n");
diff --git a/src/dev/softDev/devAoSoft.c b/src/dev/softDev/devAoSoft.c
index fcd982bf6..d42961000 100644
--- a/src/dev/softDev/devAoSoft.c
+++ b/src/dev/softDev/devAoSoft.c
@@ -33,10 +33,10 @@
 #include "epicsExport.h"
 
 /* added for Channel Access Links */
-static long init_record();
+static long init_record(aoRecord *prec);
 
 /* Create the dset for devAoSoft */
-static long write_ao();
+static long write_ao(aoRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devAoSoftCallback.c b/src/dev/softDev/devAoSoftCallback.c
index cb1aee2bf..b939a1027 100644
--- a/src/dev/softDev/devAoSoftCallback.c
+++ b/src/dev/softDev/devAoSoftCallback.c
@@ -30,7 +30,7 @@
 #include "epicsExport.h"
 
 /* Create the dset for devAoSoftCallback */
-static long write_ao();
+static long write_ao(aoRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devBoSoft.c b/src/dev/softDev/devBoSoft.c
index a630073e4..5303be7cb 100644
--- a/src/dev/softDev/devBoSoft.c
+++ b/src/dev/softDev/devBoSoft.c
@@ -31,10 +31,10 @@
 #include "boRecord.h"
 #include "epicsExport.h"
 
-static long init_record();
+static long init_record(boRecord *prec);
 
 /* Create the dset for devBoSoft */
-static long write_bo();
+static long write_bo(boRecord *prec);
 
 struct {
 	long		number;
diff --git a/src/dev/softDev/devBoSoftCallback.c b/src/dev/softDev/devBoSoftCallback.c
index 9ef0d7884..4fb553f33 100644
--- a/src/dev/softDev/devBoSoftCallback.c
+++ b/src/dev/softDev/devBoSoftCallback.c
@@ -30,7 +30,7 @@
 #include "epicsExport.h"
 
 /* Create the dset for devBoCallbackSoft */
-static long write_bo();
+static long write_bo(boRecord *prec);
 
 struct {
 	long		number;
diff --git a/src/dev/softDev/devBoSoftRaw.c b/src/dev/softDev/devBoSoftRaw.c
index a66cc864e..5d24e2138 100644
--- a/src/dev/softDev/devBoSoftRaw.c
+++ b/src/dev/softDev/devBoSoftRaw.c
@@ -31,10 +31,10 @@
 #include "epicsExport.h"
 
 /* added for Channel Access Links */
-static long init_record();
+static long init_record(boRecord *prec);
 
 /* Create the dset for devBoSoftRaw */
-static long write_bo();
+static long write_bo(boRecord *prec);
 
 struct {
 	long		number;
diff --git a/src/dev/softDev/devCalcoutSoft.c b/src/dev/softDev/devCalcoutSoft.c
index 2371dec40..f931e6ac0 100644
--- a/src/dev/softDev/devCalcoutSoft.c
+++ b/src/dev/softDev/devCalcoutSoft.c
@@ -29,7 +29,7 @@
 #include "calcoutRecord.h"
 #include "epicsExport.h"
 
-static long write_calcout();
+static long write_calcout(calcoutRecord *prec);
 
 struct {
     long	number;
diff --git a/src/dev/softDev/devCalcoutSoftCallback.c b/src/dev/softDev/devCalcoutSoftCallback.c
index b1dead1ef..894577af7 100644
--- a/src/dev/softDev/devCalcoutSoftCallback.c
+++ b/src/dev/softDev/devCalcoutSoftCallback.c
@@ -29,7 +29,7 @@
 #include "calcoutRecord.h"
 #include "epicsExport.h"
 
-static long write_calcout();
+static long write_calcout(calcoutRecord *prec);
 
 struct {
     long	number;
diff --git a/src/dev/softDev/devHistogramSoft.c b/src/dev/softDev/devHistogramSoft.c
index c12c1d07a..e6d1142ea 100644
--- a/src/dev/softDev/devHistogramSoft.c
+++ b/src/dev/softDev/devHistogramSoft.c
@@ -29,8 +29,8 @@
 #include "epicsExport.h"
 
 /* Create the dset for devHistogramSoft */
-static long init_record();
-static long read_histogram();
+static long init_record(histogramRecord *prec);
+static long read_histogram(histogramRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devLoSoft.c b/src/dev/softDev/devLoSoft.c
index 9b73538f2..5a4bdf87c 100644
--- a/src/dev/softDev/devLoSoft.c
+++ b/src/dev/softDev/devLoSoft.c
@@ -27,8 +27,8 @@
 #include "epicsExport.h"
 
 /* Create the dset for devLoSoft */
-static long init_record();
-static long write_longout();
+static long init_record(longoutRecord *prec);
+static long write_longout(longoutRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devLoSoftCallback.c b/src/dev/softDev/devLoSoftCallback.c
index 6fd4a000c..b2d351f3a 100644
--- a/src/dev/softDev/devLoSoftCallback.c
+++ b/src/dev/softDev/devLoSoftCallback.c
@@ -28,7 +28,7 @@
 #include "epicsExport.h"
 
 /* Create the dset for devLoSoftCallback */
-static long write_longout();
+static long write_longout(longoutRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devMbboDirectSoft.c b/src/dev/softDev/devMbboDirectSoft.c
index 1b61d6a3a..16487c17f 100644
--- a/src/dev/softDev/devMbboDirectSoft.c
+++ b/src/dev/softDev/devMbboDirectSoft.c
@@ -28,8 +28,8 @@
 #include "epicsExport.h"
 
 /* Create the dset for devMbboSoft */
-static long init_record();
-static long write_mbbo();
+static long init_record(mbboDirectRecord *prec);
+static long write_mbbo(mbboDirectRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devMbboDirectSoftCallback.c b/src/dev/softDev/devMbboDirectSoftCallback.c
index 1105dae7a..17a0e7b9f 100644
--- a/src/dev/softDev/devMbboDirectSoftCallback.c
+++ b/src/dev/softDev/devMbboDirectSoftCallback.c
@@ -27,7 +27,7 @@
 #include "epicsExport.h"
 
 /* Create the dset for devMbboSoft */
-static long write_mbbo();
+static long write_mbbo(mbboDirectRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devMbboDirectSoftRaw.c b/src/dev/softDev/devMbboDirectSoftRaw.c
index 6c1d6106d..c9fb1878f 100644
--- a/src/dev/softDev/devMbboDirectSoftRaw.c
+++ b/src/dev/softDev/devMbboDirectSoftRaw.c
@@ -29,8 +29,8 @@
 
 
 /* Create the dset for devMbboDirectSoftRaw */
-static long init_record();
-static long write_mbbo();
+static long init_record(mbboDirectRecord *prec);
+static long write_mbbo(mbboDirectRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devMbboSoft.c b/src/dev/softDev/devMbboSoft.c
index 685752878..5fc12373d 100644
--- a/src/dev/softDev/devMbboSoft.c
+++ b/src/dev/softDev/devMbboSoft.c
@@ -28,8 +28,8 @@
 #include "epicsExport.h"
 
 /* Create the dset for devMbboSoft */
-static long init_record();
-static long write_mbbo();
+static long init_record(mbboRecord *prec);
+static long write_mbbo(mbboRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devMbboSoftCallback.c b/src/dev/softDev/devMbboSoftCallback.c
index 04d15d11f..5f39af0a8 100644
--- a/src/dev/softDev/devMbboSoftCallback.c
+++ b/src/dev/softDev/devMbboSoftCallback.c
@@ -27,7 +27,7 @@
 #include "epicsExport.h"
 
 /* Create the dset for devMbboSoftCallback */
-static long write_mbbo();
+static long write_mbbo(mbboRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devMbboSoftRaw.c b/src/dev/softDev/devMbboSoftRaw.c
index 1842787cd..21261d1b3 100644
--- a/src/dev/softDev/devMbboSoftRaw.c
+++ b/src/dev/softDev/devMbboSoftRaw.c
@@ -27,8 +27,8 @@
 #include "epicsExport.h"
 
 /* Create the dset for devMbboSoftRaw */
-static long init_record();
-static long write_mbbo();
+static long init_record(mbboRecord *prec);
+static long write_mbbo(mbboRecord *prec);
 struct {
 	long		number;
 	DEVSUPFUN	report;
diff --git a/src/dev/softDev/devSiSoft.c b/src/dev/softDev/devSiSoft.c
index 2e6684ca3..bc5cda46c 100644
--- a/src/dev/softDev/devSiSoft.c
+++ b/src/dev/softDev/devSiSoft.c
@@ -28,8 +28,8 @@
 #include "epicsExport.h"
 
 /* Create the dset for devSiSoft */
-static long init_record();
-static long read_stringin();
+static long init_record(stringinRecord *prec);
+static long read_stringin(stringinRecord *prec);
 
 struct {
     long      number;
diff --git a/src/dev/softDev/devSoSoft.c b/src/dev/softDev/devSoSoft.c
index 6b3e61db8..bdda3a326 100644
--- a/src/dev/softDev/devSoSoft.c
+++ b/src/dev/softDev/devSoSoft.c
@@ -27,7 +27,7 @@
 #include "epicsExport.h"
 
 /* Create the dset for devSoSoft */
-static long write_stringout();
+static long write_stringout(stringoutRecord *prec);
 struct {
     long        number;
     DEVSUPFUN   report;
diff --git a/src/dev/softDev/devSoSoftCallback.c b/src/dev/softDev/devSoSoftCallback.c
index 6257a34dc..0d7bbf65f 100644
--- a/src/dev/softDev/devSoSoftCallback.c
+++ b/src/dev/softDev/devSoSoftCallback.c
@@ -27,7 +27,7 @@
 #include "epicsExport.h"
 
 /* Create the dset for devSoSoftCallback */
-static long write_stringout();
+static long write_stringout(stringoutRecord *prec);
 struct {
     long        number;
     DEVSUPFUN   report;
diff --git a/src/gdd/aitGen.c b/src/gdd/aitGen.c
index a7caef67c..5d44894ca 100644
--- a/src/gdd/aitGen.c
+++ b/src/gdd/aitGen.c
@@ -76,7 +76,7 @@ static FILE *dfd;
 /*
  * maximum, minimum value for each ait type - joh
  */
-void initMinMaxAIT ()
+void initMinMaxAIT (void)
 {
     unsigned i;
 
diff --git a/src/libCom/calc/calcPerform.c b/src/libCom/calc/calcPerform.c
index f2a364ff4..4e34df766 100644
--- a/src/libCom/calc/calcPerform.c
+++ b/src/libCom/calc/calcPerform.c
@@ -429,7 +429,7 @@ static unsigned short seed = 0xa3bf;
 static unsigned short multy = 191 * 8 + 5;  /* 191 % 8 == 5 */
 static unsigned short addy = 0x3141;
 
-static double calcRandom()
+static double calcRandom(void)
 {
     seed = (seed * multy) + addy;
 
diff --git a/src/libCom/env/envSubr.c b/src/libCom/env/envSubr.c
index f116ab66a..d4cb7024f 100644
--- a/src/libCom/env/envSubr.c
+++ b/src/libCom/env/envSubr.c
@@ -368,7 +368,7 @@ const ENV_PARAM *pParam)	/* pointer to config param structure */
 *
 *-*/
 long epicsShareAPI
-epicsPrtEnvParams()
+epicsPrtEnvParams(void)
 {
     const ENV_PARAM **ppParam = env_param_list;
      
diff --git a/src/libCom/error/errSymLib.c b/src/libCom/error/errSymLib.c
index cb76ed2fe..936c2a6fc 100644
--- a/src/libCom/error/errSymLib.c
+++ b/src/libCom/error/errSymLib.c
@@ -62,7 +62,7 @@ extern ERRSYMTAB_ID errSymTbl;
  * ell nodes that have a common hash number.
  *
  ***************************************************************/
-int epicsShareAPI errSymBld()
+int epicsShareAPI errSymBld(void)
 {
     ERRSYMBOL      *errArray = errSymTbl->symbols;
     ELLLIST        *perrnumlist = &errnumlist;
@@ -245,7 +245,7 @@ void epicsShareAPI errSymLookup (long status, char * pBuf, unsigned bufLength)
 /****************************************************************
  * errSymDump
  ***************************************************************/
-void epicsShareAPI errSymDump()
+void epicsShareAPI errSymDump(void)
 {
 ERRNUMNODE    **phashnode = NULL;
 ERRNUMNODE     *pNextNode;
diff --git a/src/libCom/error/errlog.c b/src/libCom/error/errlog.c
index ccc28c744..cb129aef5 100644
--- a/src/libCom/error/errlog.c
+++ b/src/libCom/error/errlog.c
@@ -279,7 +279,7 @@ epicsShareFunc void epicsShareAPI errlogSetSevToLog(
     pvtData.sevToLog = severity;
 }
 
-epicsShareFunc errlogSevEnum epicsShareAPI errlogGetSevToLog()
+epicsShareFunc errlogSevEnum epicsShareAPI errlogGetSevToLog(void)
 {
     errlogInit(0);
     return pvtData.sevToLog;
@@ -512,7 +512,7 @@ static void errlogThread(void)
     epicsEventSignal(pvtData.waitForExit);
 }
 
-static msgNode *msgbufGetNode()
+static msgNode *msgbufGetNode(void)
 {
     char *pbuffer = (char *)pvtData.pbuffer;
     msgNode *pnextSend = 0;
@@ -597,7 +597,7 @@ static char * msgbufGetSend(int *noConsoleMessage)
     return(pnextSend->message);
 }
 
-static void msgbufFreeSend()
+static void msgbufFreeSend(void)
 {
     msgNode *pnextSend;
 
diff --git a/src/libCom/iocsh/registry.c b/src/libCom/iocsh/registry.c
index fda15ff44..89b50ccca 100644
--- a/src/libCom/iocsh/registry.c
+++ b/src/libCom/iocsh/registry.c
@@ -77,7 +77,7 @@ epicsShareFunc void * epicsShareAPI registryFind(
     return(pentry->userPvt);
 }
 
-epicsShareFunc void epicsShareAPI registryFree()
+epicsShareFunc void epicsShareAPI registryFree(void)
 {
     if(!gphPvt) return;
     gphFreeMem(gphPvt);
diff --git a/src/libCom/iocsh/registry.h b/src/libCom/iocsh/registry.h
index b612073c1..ea1bb7ce7 100644
--- a/src/libCom/iocsh/registry.h
+++ b/src/libCom/iocsh/registry.h
@@ -25,7 +25,7 @@ epicsShareFunc int epicsShareAPI registryChange(
     void *registryID,const char *name,void *data);
 
 epicsShareFunc int epicsShareAPI registrySetTableSize(int size);
-epicsShareFunc void epicsShareAPI registryFree();
+epicsShareFunc void epicsShareAPI registryFree(void);
 epicsShareFunc int epicsShareAPI registryDump(void);
 
 #ifdef __cplusplus
diff --git a/src/libCom/logClient/iocLog.c b/src/libCom/logClient/iocLog.c
index fd84f4ac1..a5a46dcec 100644
--- a/src/libCom/logClient/iocLog.c
+++ b/src/libCom/logClient/iocLog.c
@@ -72,7 +72,7 @@ LOCAL int getConfig (struct in_addr *pserver_addr, unsigned short *pserver_port)
 /*
  *  iocLogFlush ()
  */
-void epicsShareAPI epicsShareAPI iocLogFlush ()
+void epicsShareAPI epicsShareAPI iocLogFlush (void)
 {
     if (iocLogClient!=NULL) {
         logClientFlush (iocLogClient);
@@ -139,7 +139,7 @@ void epicsShareAPI iocLogShow (unsigned level)
 /*
  *  logClientInit(); deprecated
  */
-logClientId epicsShareAPI logClientInit ()
+logClientId epicsShareAPI logClientInit (void)
 {
     return iocLogClientInit ();
 }
diff --git a/src/libCom/logClient/iocLog.h b/src/libCom/logClient/iocLog.h
index 82fc4fa3a..b6f7ddf6e 100644
--- a/src/libCom/logClient/iocLog.h
+++ b/src/libCom/logClient/iocLog.h
@@ -29,7 +29,7 @@ extern "C" {
 epicsShareExtern int iocLogDisable;
 epicsShareFunc int epicsShareAPI iocLogInit (void);
 epicsShareFunc void epicsShareAPI iocLogShow (unsigned level);
-epicsShareFunc void epicsShareAPI iocLogFlush ();
+epicsShareFunc void epicsShareAPI iocLogFlush (void);
 
 #ifdef __cplusplus
 }
diff --git a/src/libCom/misc/epicsExit.c b/src/libCom/misc/epicsExit.c
index 8d1affb05..0280000a2 100644
--- a/src/libCom/misc/epicsExit.c
+++ b/src/libCom/misc/epicsExit.c
@@ -56,7 +56,7 @@ static void destroyExitPvt ( exitPvt * pep )
     free ( pep );
 }
 
-static exitPvt * createExitPvt ()
+static exitPvt * createExitPvt (void)
 {
     exitPvt * pep = calloc ( 1, sizeof ( * pep ) );
     if ( pep ) {
diff --git a/src/libCom/misc/epicsUnitTest.c b/src/libCom/misc/epicsUnitTest.c
index 580c32f2b..6ae84b31c 100644
--- a/src/libCom/misc/epicsUnitTest.c
+++ b/src/libCom/misc/epicsUnitTest.c
@@ -130,7 +130,7 @@ void testTodoBegin(const char *why) {
     epicsMutexUnlock(testLock);
 }
 
-void testTodoEnd() {
+void testTodoEnd(void) {
     todo = NULL;
 }
 
diff --git a/src/libCom/misc/epicsUnitTest.h b/src/libCom/misc/epicsUnitTest.h
index b6fb6d23d..9ac243d12 100644
--- a/src/libCom/misc/epicsUnitTest.h
+++ b/src/libCom/misc/epicsUnitTest.h
@@ -28,7 +28,7 @@ epicsShareFunc void testFail(const char *fmt, ...)
 						EPICS_PRINTF_STYLE(1, 2);
 epicsShareFunc void testSkip(int skip, const char *why);
 epicsShareFunc void testTodoBegin(const char *why);
-epicsShareFunc void testTodoEnd();
+epicsShareFunc void testTodoEnd(void);
 epicsShareFunc int  testDiag(const char *fmt, ...)
 						EPICS_PRINTF_STYLE(1, 2);
 epicsShareFunc void testAbort(const char *fmt, ...)
diff --git a/src/libCom/taskwd/taskwd.c b/src/libCom/taskwd/taskwd.c
index 882951224..4f7469288 100644
--- a/src/libCom/taskwd/taskwd.c
+++ b/src/libCom/taskwd/taskwd.c
@@ -161,7 +161,7 @@ static void twdInitOnce(void *arg)
     epicsAtExit(twdShutdown, NULL);
 }
 
-void taskwdInit()
+void taskwdInit(void)
 {
     static epicsThreadOnceId twdOnceFlag = EPICS_THREAD_ONCE_INIT;
     epicsThreadOnce(&twdOnceFlag, twdInitOnce, NULL);
diff --git a/src/libCom/test/epicsStdioTest.c b/src/libCom/test/epicsStdioTest.c
index d72fe7d57..15f153198 100644
--- a/src/libCom/test/epicsStdioTest.c
+++ b/src/libCom/test/epicsStdioTest.c
@@ -29,7 +29,7 @@
 #define LINE_1 "# This is first line of sample report\n"
 #define LINE_2 "# This is second and last line of sample report\n"
 
-static void testEpicsSnprintf() {
+static void testEpicsSnprintf(void) {
     char exbuffer[80], buffer[80];
     const int ivalue = 1234;
     const float fvalue = 1.23e4;
diff --git a/src/libCom/test/epicsStringTest.c b/src/libCom/test/epicsStringTest.c
index 1a9b46ead..46b88f7e2 100644
--- a/src/libCom/test/epicsStringTest.c
+++ b/src/libCom/test/epicsStringTest.c
@@ -17,7 +17,7 @@
 #include "epicsString.h"
 #include "testMain.h"
 
-void testChars() {
+void testChars(void) {
     int i;
     char input[2] = {0, 0};
     char escaped[20];
diff --git a/src/libCom/test/epicsUnitTestTest.c b/src/libCom/test/epicsUnitTestTest.c
index 5b4224d5e..ee079a491 100644
--- a/src/libCom/test/epicsUnitTestTest.c
+++ b/src/libCom/test/epicsUnitTestTest.c
@@ -16,7 +16,7 @@
 #define testOk1_success 1
 #define testOk1_failure 0
 
-int main () {
+int main (void) {
     testPlan(11);
     testOk(1, "testOk(1)");
     testOk(0, "testOk(0)");
diff --git a/src/rec/mbboRecord.c b/src/rec/mbboRecord.c
index 64d9f291b..6508830ec 100644
--- a/src/rec/mbboRecord.c
+++ b/src/rec/mbboRecord.c
@@ -94,7 +94,7 @@ struct mbbodset { /* multi bit binary output dset */
 static void checkAlarms(mbboRecord *);
 static void convert(mbboRecord *);
 static void monitor(mbboRecord *);
-static long writeValue();
+static long writeValue(mbboRecord *);
 
 
 static void init_common(mbboRecord *prec)
diff --git a/src/rsrv/camessage.c b/src/rsrv/camessage.c
index 15477508f..c42294366 100644
--- a/src/rsrv/camessage.c
+++ b/src/rsrv/camessage.c
@@ -1570,7 +1570,7 @@ LOCAL void putNotifyErrorReply ( struct client *client, caHdrLargeArray *mp, int
     SEND_UNLOCK ( client );
 }
 
-void initializePutNotifyFreeList ()
+void initializePutNotifyFreeList (void)
 {
     if ( ! rsrvPutNotifyFreeList ) {
         freeListInitPvt ( &rsrvPutNotifyFreeList, 
diff --git a/src/rsrv/cast_server.c b/src/rsrv/cast_server.c
index 29fd2adfc..524c38d6a 100644
--- a/src/rsrv/cast_server.c
+++ b/src/rsrv/cast_server.c
@@ -55,7 +55,7 @@
 /*
  * clean_addrq
  */
-LOCAL void clean_addrq()
+LOCAL void clean_addrq(void)
 {
     struct channel_in_use * pciu;
     struct channel_in_use * pnextciu;
diff --git a/src/toolsComm/flex/flexdef.h b/src/toolsComm/flex/flexdef.h
index 3b68ebd4e..b465eed7c 100644
--- a/src/toolsComm/flex/flexdef.h
+++ b/src/toolsComm/flex/flexdef.h
@@ -82,7 +82,7 @@ char *sprintf(); /* keep lint happy */
 void *memset();
 #else
 #if !defined(ultrix) && !defined(NeXT) && !defined(sgi) && !defined(hppa) && !defined(__osf__)
-char *memset();
+char *memset(void *, int, size_t);
 #endif
 #endif
 #endif
diff --git a/src/util/iocLogServer.c b/src/util/iocLogServer.c
index 92b7471bc..360daaec7 100644
--- a/src/util/iocLogServer.c
+++ b/src/util/iocLogServer.c
@@ -95,7 +95,7 @@ static int sighupPipe[2];
  *	main()
  *
  */
-int main()
+int main(void)
 {
 	struct sockaddr_in serverAddr;	/* server's address */
 	struct timeval timeout;
@@ -953,7 +953,7 @@ static void serviceSighupRequest(void *pParam)
  *
  *
  */
-static int getDirectory()
+static int getDirectory(void)
 {
 	FILE		*pipe;
 	char		dir[256];