--- indent-2.2.9/man/texinfo2man.c
+++ indent-2.2.9/man/texinfo2man.c
@@ -162,7 +162,7 @@
 
 static char value_updated[64], value_edition[64], value_version[64];
 
-process_texi (FILE * in)
+void process_texi (FILE * in)
 {
   char buf[1024];
   int in_block = 0;
--- indent-2.2.9/src/output.c
+++ indent-2.2.9/src/output.c
@@ -1206,7 +1206,7 @@
     }
 }
 
-extern inhibit_indenting(
+extern void inhibit_indenting(
     BOOLEAN flag)
 {
     inhibited = flag;
--- indent-2.2.9/src/output.h
+++ indent-2.2.9/src/output.h
@@ -47,7 +47,7 @@
     struct stat * file_stats,
      const char  * filename);
 
-extern inhibit_indenting(
+extern void inhibit_indenting(
     BOOLEAN flag);