diff --git a/cmd_cp.c b/cmd_cp.c
index 9a6845c..866805a 100755
--- a/cmd_cp.c
+++ b/cmd_cp.c
@@ -5,6 +5,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <limits.h>
 #include "getopt.h"
diff --git a/cmd_ls.c b/cmd_ls.c
index 2ed38cf..738fb03 100755
--- a/cmd_ls.c
+++ b/cmd_ls.c
@@ -5,6 +5,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <assert.h>
 #include <time.h>
 #include "interface.h"
diff --git a/configure b/configure
index bb18d07..1b427d2 100755
--- a/configure
+++ b/configure
@@ -1135,7 +1135,7 @@ cat > conftest.$ac_ext << EOF
 #line 1136 "configure"
 #include "confdefs.h"
 
-main(){return(0);}
+int main(){return(0);}
 EOF
 if { (eval echo configure:1141: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   ac_cv_prog_cc_works=yes
@@ -2084,7 +2084,7 @@ else
   cat > conftest.$ac_ext <<EOF
 #line 2086 "configure"
 #include "confdefs.h"
-main() { exit (fnmatch ("a*", "abc", 0) != 0); }
+int main() { exit (fnmatch ("a*", "abc", 0) != 0); }
 EOF
 if { (eval echo configure:2090: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
diff --git a/output.c b/output.c
index f8a2b7b..70c0e17 100755
--- a/output.c
+++ b/output.c
@@ -54,7 +54,7 @@ int display(displaylevel_t level, char *format, ...)
      /* get the verbosity level from the fatback symbol table */
      if (!(verbose_var = get_fbvar("verbose"))) {
           printf("Error reading variable\n");
-          return;
+          return -1;
      } else {
           verbose = verbose_var->val.ival;
           free(verbose_var);