--- configure.orig	2013-11-19 16:47:26.000000000 +0100
+++ configure	2013-11-19 16:47:26.000000000 +0100
@@ -1108,7 +1108,7 @@
 cat > conftest.$ac_ext <<EOF
 #line 1110 "configure"
 #include "confdefs.h"
-main(){return(0);}
+int main(){return(0);}
 EOF
 if { (eval echo configure:1114: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
   ac_cv_prog_cc_works=yes
@@ -1524,7 +1524,7 @@
 cat > conftest.$ac_ext <<EOF
 #line 1526 "configure"
 #include "confdefs.h"
-main(){return(0);}
+int main(){return(0);}
 EOF
 if { (eval echo configure:1530: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
   ac_cv_prog_cc_works=yes
@@ -1650,7 +1650,7 @@
 cat > conftest.$ac_ext <<EOF
 #line 1652 "configure"
 #include "confdefs.h"
-main(){return(0);}
+int main(){return(0);}
 EOF
 if { (eval echo configure:1656: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
   ac_cv_prog_cxx_works=yes
@@ -2639,7 +2639,7 @@
 #line 2640 "configure"
 #include "confdefs.h"
 
-main()
+int main()
 {
   char c0 = 0x40, c1 = 0x80, c2 = 0x81;
   exit(memcmp(&c0, &c2, 1) < 0 && memcmp(&c1, &c2, 1) < 0 ? 0 : 1);