--- rzip-2.1.old/configure
+++ rzip-2.1/configure
@@ -655,7 +655,7 @@
 #line 656 "configure"
 #include "confdefs.h"
 
-main(){return(0);}
+int main(){return(0);}
 EOF
 if { (eval echo configure:661: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   ac_cv_prog_cc_works=yes
@@ -1627,7 +1627,7 @@
 
 #include <stdio.h>
 #include <sys/types.h>
-main() { return (sizeof(off_t) == 4); }
+int main() { return (sizeof(off_t) == 4); }
 EOF
 if { (eval echo configure:1633: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
--- rzip-2.1.old/configure.in
+++ rzip-2.1/configure.in
@@ -30,7 +30,7 @@
 AC_TRY_RUN([
 #include <stdio.h>
 #include <sys/types.h>
-main() { return (sizeof(off_t) == 4); }],
+int main() { return (sizeof(off_t) == 4); }],
 rzip_cv_HAVE_LARGE_FILES=yes,
 rzip_cv_HAVE_LARGE_FILES=no,
 rzip_cv_HAVE_LARGE_FILES=cross)])