Fixes following error:

1. error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
2. error: call to undeclared library function '...' with type '...'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
3. error: call to undeclared function '...'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
4. error: incompatible function pointer types initializing 'void (*)()' with an expression of type 'int (FILE *)' (aka 'int (struct _IO_FILE *)') [-Wincompatible-function-pointer-types]
5. error: incompatible pointer to integer conversion assigning to 'int' from 'char *' [-Wint-conversion]
6. error: undefined reference to `GC_version'
7. warning: unused variable '*** [-Wunused-variable]
8. warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
9. warning: variable '*' set but not used [-Wunused-but-set-variable]

diff --git a/configure b/configure
index 14ff1d2..5fc2f74 100755
--- a/configure
+++ b/configure
@@ -4,7 +4,7 @@
 #
 
 #
-if ./which uname > /dev/null ; then
+if ./which uname ; then
   sysname=`uname -s`
   sysversion=`uname -r`
   platform=`uname -m`
@@ -256,12 +256,20 @@ do_sigtest() {
  echo "#include <signal.h>" > _zmachdep.c
 
  if [ "$2" = void ]; then
-  echo "$1 _handler($2) {}" >> _zmachdep.c
+  if [ "$1" = int ] ; then
+   echo "$1 _handler($2) {return 0;}" >> _zmachdep.c
+  else
+   echo "$1 _handler($2) {}" >> _zmachdep.c
+  fi
  else
-  echo "$1 _handler($2 x) {}" >> _zmachdep.c
+  if [ "$1" = int ] ; then
+   echo "$1 _handler($2 x) {return 0;}" >> _zmachdep.c
+  else
+   echo "$1 _handler($2 x) {}" >> _zmachdep.c
+  fi
  fi
 
- echo "int main(void) { $1 (*hdl)($2); hdl = signal(SIGINT,_handler); return 0; }" >> _zmachdep.c
+ echo "int main(void) { $1 (*hdl)($2); hdl = signal(SIGINT,_handler); (void)hdl; return 0; }" >> _zmachdep.c
  $cc $cflags -o _zmachdep _zmachdep.c > _zwarning 2>&1 
  stat=$?
  warning=`cat _zwarning`
@@ -283,7 +291,7 @@ return 0;
 }
 EOF
 
- if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+ if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
   echo "You don't need \"-lintl\""
  else
   echo "You need \"-lintl\""
@@ -1346,7 +1354,10 @@ fi
 termlib=''
 
 cat > _zmachdep.c << EOF
-main()
+#include <stdlib.h>
+#include <curses.h>
+#include <term.h>
+int main()
 {
   char bp[100];
   tgetent(bp,getenv("TERM"));
@@ -1362,7 +1373,7 @@ if [ -z "$dtermlib" ]; then
     # check if the lib works...
     Echo "Terminal library -l$lib found at $tlibdir, "
 
-    if $cc $cflags -o _zmachdep _zmachdep.c -l$lib > /dev/null 2>&1; then
+    if $cc $cflags -o _zmachdep _zmachdep.c -l$lib 2>&1; then
      echo "and it seems to work."
      termlib=-l$lib
     else
@@ -1500,15 +1511,16 @@ done
 
 if [ -n "$gclib" -a -n "$gcinclude" ]; then
  cat > _zmachdep.c << EOF
+#include <stdio.h>
 #include <gc.h>
-main()
+int main()
 {
-  extern unsigned GC_version;
+  unsigned GC_version = GC_get_version();
   printf("%d%02d%03d\n",(GC_version>>16)&0xff,(GC_version>>8)&0xff,GC_version&0xff);
 }
 EOF
 
- if $cc $cflags $gc_cflags -I$gcinclude -o _zmachdep _zmachdep.c $gclib > /dev/null 2>&1; then
+ if $cc $cflags $gc_cflags -I$gcinclude -o _zmachdep _zmachdep.c $gclib 2>&1; then
   echo "and it seems to work."
   gcversion=`./_zmachdep`
  fi
@@ -1644,24 +1656,26 @@ def_param use_help_cgi $have_perl
 
 ####### long long
 cat > _zmachdep.c <<EOF
-main()
+int main()
 {
   int i = sizeof(unsigned long long);
+  (void)i;
 }
 EOF
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1
 then
     echo "You have long long"
     def_have_long_long="typedef long long clen_t;"
     cat > _zmachdep.c <<EOF
 #include <stdlib.h>
-main()
+int main()
 {
     const char *s = "1";
     long long ll = strtoll(s, NULL, 10);
+    (void)ll;
 }
 EOF
-    if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1
+    if $cc $cflags -o _zmachdep _zmachdep.c 2>&1
     then
 	echo "You have strtoll()"
 	def_have_strtoll="#define HAVE_STRTOLL"
@@ -1673,13 +1687,14 @@ EOF
 #include <sys/types.h>
 #include <stdlib.h>
 #include <limits.h>
-main()
+int main()
 {
     const char *s = "1";
     quad_t q = strtoq(s, NULL, 10);
+    (void)q;
 }
 EOF
-    if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1
+    if $cc $cflags -o _zmachdep _zmachdep.c 2>&1
     then
 	echo "You have strtoq()"
 	def_have_strtoq="#define HAVE_STRTOQ"
@@ -1695,15 +1710,16 @@ fi
 ####### strcasecmp
 
 cat > _zmachdep.c << EOF
-#include <string.h>
-main()
+#include <strings.h>
+int main()
 {
   int i;
   i = strcasecmp("abc","def");
+  (void)i;
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have strcasecmp()."
  def_have_strcasecmp="#define HAVE_STRCASECMP"
 else
@@ -1714,13 +1730,14 @@ fi
 ####### strcasestr
 cat > _zmachdep.c << EOF
 #include <string.h>
-main()
+int main()
 {
-  int i;
-  i = strcasestr("abc","def");
+  char *p;
+  p = strcasestr("abc","def");
+  (void)p;
 }
 EOF
-if $cc $cflags -D_GNU_SOURCE -o _zmachdep _zmachdep.c > /dev/null 2>&1
+if $cc $cflags -D_GNU_SOURCE -o _zmachdep _zmachdep.c 2>&1
 then
   echo "You have strcasestr()."
   def_have_strcasestr="#define HAVE_STRCASESTR"
@@ -1733,14 +1750,15 @@ fi
 
 cat > _zmachdep.c << EOF
 #include <string.h>
-main()
+int main()
 {
   char *p, *q = "abc";
   p = strchr(q,'c');
+  (void)p;
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have strchr()."
  def_have_strchr="#define HAVE_STRCHR"
 else
@@ -1751,14 +1769,16 @@ fi
 ####### strerror
 
 cat > _zmachdep.c << EOF
-main()
+#include <string.h>
+int main()
 {
-  int i;
-  i = strerror(0);
+  char *p;
+  p = strerror(0);
+  (void)p;
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have strerror()."
  def_have_strerror="#define HAVE_STRERROR"
 else
@@ -1769,13 +1789,13 @@ fi
 ####### sys_errlist
 
 cat > _zmachdep.c << EOF
-main()
+int main()
 {
   extern char sys_errlist[];
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have sys_errlist[]."
  def_have_syserrlist="#define HAVE_SYS_ERRLIST"
 else
@@ -1786,7 +1806,8 @@ fi
 ####### bcopy
 
 cat > _zmachdep.c << EOF
-main()
+#include <string.h>
+int main()
 {
   char x[1],y[1];
   bzero(x,1);
@@ -1794,7 +1815,7 @@ main()
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have bcopy()."
  def_have_bcopy="#define HAVE_BCOPY"
 else
@@ -1805,10 +1826,12 @@ fi
 ####### waitpid
 
 cat > _zmachdep.c << EOF
+#include <unistd.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 
-main()
+int main()
 {
     pid_t pid;
     int status;
@@ -1820,7 +1843,7 @@ main()
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have waitpid()."
  def_have_waitpid="#define HAVE_WAITPID"
 else
@@ -1831,6 +1854,8 @@ fi
 ####### wait3
 
 cat > _zmachdep.c << EOF
+#include <unistd.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <time.h>
 #include <sys/time.h>
@@ -1840,7 +1865,7 @@ cat > _zmachdep.c << EOF
 #define NULL 0
 #endif
 
-main()
+int main()
 {
     int pid;
     int status;
@@ -1852,12 +1877,12 @@ main()
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have wait3()."
  def_have_wait3="#define HAVE_WAIT3"
 else
  echo "You don't have wait3()."
- def_have_wait3="#undef HAVE_WAITPID"
+ def_have_wait3="#undef HAVE_WAIT3"
 fi
 
 ####### strftime
@@ -1865,17 +1890,18 @@ fi
 cat > _zmachdep.c << EOF
 #include <time.h>
 
-main()
+int main()
 {
     time_t ct;
     struct tm *tm;
     char t[80];
     time(&ct);
     strftime(t, 80, "%a, %d %b %Y %H:%M:%S GMT",gmtime(&ct));
+    (void)tm;
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have strftime()."
  def_have_strftime="#define HAVE_STRFTIME"
 else
@@ -1888,18 +1914,19 @@ fi
 cat > _zmachdep.c << EOF
 #include <sys/param.h>
 #include <unistd.h>
-main()
+int main()
 {
 #ifdef MAXPATHLEN
   char path[MAXPATHLEN];
-  getcwd(path,MAXPATHLEN);
+  char *p = getcwd(path,MAXPATHLEN);
+  (void)p;
 #else
   gwtcwd(NULL, 0);
 #endif
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have getcwd()."
  def_have_getcwd="#define HAVE_GETCWD"
 else
@@ -1910,14 +1937,16 @@ fi
 ####### getwd
 
 cat > _zmachdep.c << EOF
-main()
+#include <unistd.h>
+int main()
 {
   char path[64];
-  getwd(path);
+  char *p = getwd(path);
+  (void)p;
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have getwd()."
  def_have_getwd="#define HAVE_GETWD"
 else
@@ -1927,13 +1956,15 @@ fi
 
 ####### symlink
 cat > _zmachdep.c << EOF
-main()
+#include <unistd.h>
+int main()
 {
   char path[64],lpath[64];
-  symlink(path,lpath);
+  int i = symlink(path,lpath);
+  (void)i;
 }
 EOF
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1
 then
   echo "You have symlink()."
   def_have_symlink="#define HAVE_SYMLINK"
@@ -1945,14 +1976,16 @@ fi
 ####### readlink
 
 cat > _zmachdep.c << EOF
-main()
+#include <unistd.h>
+int main()
 {
   char path[64],lpath[64];
-  readlink(path,lpath,64);
+  ssize_t l = readlink(path,lpath,64);
+  (void)l;
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have readlink()."
  def_have_readlink="#define HAVE_READLINK"
 else
@@ -1964,14 +1997,14 @@ fi
 cat > _zmachdep.c << EOF
 #include <sys/types.h>
 #include <sys/stat.h>
-main()
+int main()
 {
   struct stat st;
   char path[64];
   lstat(path,&st);
 }
 EOF
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1
 then
   echo "You have lstat()."
   def_have_lstat="#define HAVE_LSTAT"
@@ -1984,13 +2017,13 @@ fi
 
 cat > _zmachdep.c << EOF
 #include <stdlib.h>
-main()
+int main()
 {
   setenv("HOGE","hoge",1);
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have setenv()."
  def_have_setenv="#define HAVE_SETENV"
 else
@@ -2002,13 +2035,13 @@ fi
 
 cat > _zmachdep.c << EOF
 #include <stdlib.h>
-main()
+int main()
 {
   putenv("HOGE=hoge");
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have putenv()."
  def_have_putenv="#define HAVE_PUTENV"
 else
@@ -2019,8 +2052,9 @@ fi
 ####### sigsetjmp
 
 cat > _zmachdep.c << EOF
+#include <stdlib.h>
 #include <setjmp.h>
-main()
+int main()
 {
   jmp_buf env;
   if (sigsetjmp(env,1) != 0) {
@@ -2030,7 +2064,7 @@ main()
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have sigsetjmp()."
  def_setjmp="#define SETJMP(env) sigsetjmp(env,1)"
  def_longjmp="#define LONGJMP(env,val) siglongjmp(env,val)"
@@ -2046,13 +2080,13 @@ fi
 
 cat > _zmachdep.c << EOF
 #include <stdlib.h>
-main()
+int main()
 {
   srand48(0);
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have srand48()."
  def_have_srand48="#define HAVE_SRAND48"
 else
@@ -2064,13 +2098,13 @@ fi
 
 cat > _zmachdep.c << EOF
 #include <stdlib.h>
-main()
+int main()
 {
   srandom(0);
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have srandom()."
  def_have_srandom="#define HAVE_SRANDOM"
 else
@@ -2082,13 +2116,13 @@ fi
 
  cat > _zmachdep.c << EOF
 #include <unistd.h>
-main()
+int main()
 {
   getpassphrase("");
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have getpassphrase()."
  def_have_getpassphrase="#define HAVE_GETPASSPHRASE"
 else
@@ -2101,13 +2135,14 @@ fi
 cat > _zmachdep.c <<EOF
 #include <stdio.h>
 #include <unistd.h>
-main()
+int main()
 {
- int (*c)() = chdir;
+ int (*c)(const char *) = chdir;
+ (void)c;
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have chdir()."
  def_have_chdir="#define HAVE_CHDIR"
 else
@@ -2120,13 +2155,14 @@ fi
 cat > _zmachdep.c << EOF
 #include <stdio.h>
 #include <stdlib.h>
-main()
+int main()
 {
-  void (*c)() = fclose;
+  int (*c)(FILE *) = fclose;
+  (void)c;
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "fclose() is declared."
  dcl_fclose=''
 else
@@ -2139,13 +2175,14 @@ fi
 cat > _zmachdep.c << EOF
 #include <stdio.h>
 #include <stdlib.h>
-main()
+int main()
 {
-  void (*c)() = pclose;
+  int (*c)(FILE *) = pclose;
+  (void)c;
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "pclose() is declared."
  dcl_pclose=''
 else
@@ -2248,13 +2285,13 @@ fi
 
 cat > _zmachdep.c << EOF
 #include <float.h>
-main()
+int main()
 {
   ;
 }
 EOF
 
-if $cc $cflags -c _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -c _zmachdep.c 2>&1; then
  echo "You have float.h."
  def_have_float_h='#define HAVE_FLOAT_H'
 else
@@ -2265,13 +2302,13 @@ fi
 
 cat > _zmachdep.c <<EOF
 #include <sys/select.h>
-main()
+int main()
 { 
   ;
 }
 EOF
 
-if $cc $cflags -c _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -c _zmachdep.c 2>&1; then
  echo "You have sys/select.h."
  def_sys_select_h='#define HAVE_SYS_SELECT_H'
 else
@@ -2289,7 +2326,7 @@ int main(){
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have setpgrp()."
  def_have_setpgrp='#define HAVE_SETPGRP'
 else
@@ -2302,7 +2339,7 @@ int main(){
 }
 EOF
 
- if $cc $cflags -o _zmachdep _zmachdep.c $extlib > /dev/null 2>&1; then
+ if $cc $cflags -o _zmachdep _zmachdep.c $extlib 2>&1; then
   echo "You have setpgrp( pid, pgrp )."
   def_have_setpgrp='#define HAVE_SETPGRP'
   def_setpgrp='#define SETPGRP() setpgrp( 0, 0 )'
@@ -2318,7 +2355,7 @@ cat > _zmachdep.c <<EOF
 #include <stdarg.h>
 #include <stdio.h>
 
-main()
+int main()
 {
  va_list a, b;
 
@@ -2327,7 +2364,7 @@ main()
 }
 EOF
 
-if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
  echo "You have va_copy()."
  def_have_va_copy='#define HAVE_VA_COPY'
  def_va_copy=
@@ -2339,7 +2376,7 @@ cat > _zmachdep.c <<EOF
 #include <stdarg.h>
 #include <stdio.h>
 
-main()
+int main()
 {
  va_list a, b;
 
@@ -2348,7 +2385,7 @@ main()
 }
 EOF
 
- if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+ if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
   echo "You have __va_copy()."
   def_va_copy='#define va_copy(dest, src) __va_copy(dest, src)'
  else
@@ -2357,7 +2394,7 @@ cat > _zmachdep.c <<EOF
 #include <stdarg.h>
 #include <stdio.h>
 
-main()
+int main()
 {
  va_list a, b;
 
@@ -2366,7 +2403,7 @@ main()
 }
 EOF
 
-  if $cc $cflags -o _zmachdep _zmachdep.c > /dev/null 2>&1; then
+  if $cc $cflags -o _zmachdep _zmachdep.c 2>&1; then
    echo "Your va_list is not an array."
    def_va_copy='#define va_copy(dest, src) ((dest) = (src))'
   else
@@ -2379,9 +2416,10 @@ fi
 ###### IPv6 support check
 
 cat > _zmachdep.c <<EOF
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/socket.h>
-main()
+int main()
 {
  if (socket(AF_INET6, SOCK_STREAM, 0) < 0)
    exit(1);
@@ -2394,7 +2432,7 @@ def_ipv6="#undef INET6"
 v6_ss_family=""
 v6lib=''
 
-if $cc $cflags -o _zmachdep _zmachdep.c $extlib > /dev/null 2>&1; then
+if $cc $cflags -o _zmachdep _zmachdep.c $extlib 2>&1; then
  if ./_zmachdep; then
   def_ipv6="#define INET6"
  else
@@ -2421,7 +2459,7 @@ int main() {
 }
 EOF
 
-    if $cc $cflags -o _zmachdep _zmachdep.c $extlib > /dev/null 2>&1; then
+    if $cc $cflags -o _zmachdep _zmachdep.c $extlib 2>&1; then
      echo "You have getaddrinfo() in libc."
     else
      for tlibdir in /usr/local/v6/lib /usr/local/lib /usr/lib; do
@@ -2432,7 +2470,7 @@ EOF
 
        v6lib="$v6lib -linet6"
 
-       if $cc $cflags -o _zmachdep _zmachdep.c $extlib $v6lib > /dev/null 2>&1; then
+       if $cc $cflags -o _zmachdep _zmachdep.c $extlib $v6lib 2>&1; then
 	echo "You have getaddrinfo() in libinet6."
        fi
 
@@ -2461,10 +2499,11 @@ if [ "$def_ipv6" = "#define INET6" ]; then
 int main() {
     struct sockaddr_storage ss;
     int i = ss.ss_family;
+    (void)i;
 }
 EOF
 
- if $cc $cflags -o _zmachdep _zmachdep.c $extlib > /dev/null 2>&1; then
+ if $cc $cflags -o _zmachdep _zmachdep.c $extlib 2>&1; then
   echo "You have ss_family."
  else
   cat > _zmachdep.c <<EOF
@@ -2475,7 +2514,7 @@ int main() {
 }
 EOF
 
-  if $cc $cflags -o _zmachdep _zmachdep.c $extlib > /dev/null 2>&1; then
+  if $cc $cflags -o _zmachdep _zmachdep.c $extlib 2>&1; then
    echo "You have __ss_family."
    def_ipv6_ss_family="#define ss_family __ss_family"
   else
@@ -2996,7 +3035,7 @@ cat > extrvers.c << EOF
 #include <stdio.h>
 #include <string.h>
 #include "version.c"
-main()
+int main()
 {
   char *p = strchr(w3m_version,'/');
   if (p == NULL)
@@ -3006,7 +3045,7 @@ main()
 }
 EOF
 
-$cc $cflags $mb_cflag -o extrvers$extension extrvers.c  > /dev/null 2>&1
+$cc $cflags $mb_cflag -o extrvers$extension extrvers.c 2>&1
 w3mversion=`./extrvers`
 echo "Current w3m version is $w3mversion."
 rm -f extrvers.c extrvers$extension