diff -Naurp robodoc-4.99.43.orig/Source/analyser.c robodoc-4.99.43.new/Source/analyser.c
--- robodoc-4.99.43.orig/Source/analyser.c	2015-04-11 19:28:57.000000000 +0200
+++ robodoc-4.99.43.new/Source/analyser.c	2018-03-07 15:08:37.115748466 +0100
@@ -621,8 +621,6 @@ static void Preformat_All(
  */
 {
     int                 i;
-    int                 preformatted = FALSE;
-    char               *line = NULL;
 
     if ( arg_item->no_lines > 0 )
     {
@@ -635,13 +633,11 @@ static void Preformat_All(
             /* Empty */
         }
 
-        line = arg_item->lines[i]->line;
         if ( ( arg_item->lines[i]->kind == ITEM_LINE_RAW ) ||
              ( arg_item->lines[i]->kind == ITEM_LINE_PLAIN ) )
         {
             arg_item->lines[i]->format |=
                 RBILA_BEGIN_PRE | ( source ? RBILA_BEGIN_SOURCE : 0 );
-            preformatted = TRUE;
 
             for ( ++i; i < arg_item->no_lines; i++ )
             {
diff -Naurp robodoc-4.99.43.orig/Source/generator.c robodoc-4.99.43.new/Source/generator.c
--- robodoc-4.99.43.orig/Source/generator.c	2015-04-11 19:28:57.000000000 +0200
+++ robodoc-4.99.43.new/Source/generator.c	2018-03-07 15:20:58.374982012 +0100
@@ -2045,7 +2045,7 @@ static void Generate_Item(
             RB_Change_To_Docdir( docname );
 
             /* Execute line */
-            system( line );
+            IGNORE(system(line));
 
             /* Get back to working dir */
             RB_Change_Back_To_CWD(  );
@@ -2056,7 +2056,7 @@ static void Generate_Item(
         {
             Format_Line( f, item_line->format );
 
-                FILE               *in = NULL, *dot_pipe = NULL;
+                FILE               *in = NULL;
                 char                str[TEMP_BUF_SIZE];
 
                 /* Change to docdir */
diff -Naurp robodoc-4.99.43.orig/Source/robodoc.c robodoc-4.99.43.new/Source/robodoc.c
--- robodoc-4.99.43.orig/Source/robodoc.c	2015-04-11 19:28:57.000000000 +0200
+++ robodoc-4.99.43.new/Source/robodoc.c	2018-03-07 15:08:37.116748476 +0100
@@ -387,7 +387,9 @@ int main(
     struct RB_Directory *srctree = NULL;
     char               *optstr = NULL;
     char               *used_rc_file = NULL;
+#ifdef __APPLE__
     long                debug = 0;
+#endif
 
 /*
    TODO, make setlocale work.
@@ -462,7 +464,10 @@ int main(
     document = RB_Get_RB_Document(  );
     document->doctype = output_mode;
     document->actions = Find_Actions(  );
-    debug = document->debugmode = Find_DebugMode(  );
+#ifdef __APPLE__
+    debug =
+#endif
+	document->debugmode = Find_DebugMode(  );
     document->charset = Find_Parameterized_Option( "--charset" );
     document->extension = Find_Parameterized_Option( "--ext" );
     document->css = Find_Parameterized_Option( "--css" );
diff -Naurp robodoc-4.99.43.orig/Source/robodoc.h robodoc-4.99.43.new/Source/robodoc.h
--- robodoc-4.99.43.orig/Source/robodoc.h	2015-04-11 23:09:23.000000000 +0200
+++ robodoc-4.99.43.new/Source/robodoc.h	2018-03-07 15:08:37.117748486 +0100
@@ -31,6 +31,9 @@ along with this program.  If not, see <h
 #define VERSION "4.99.43"
 #endif
 
+/* Macro to silent unused-result warnings. */
+#define IGNORE(v)	{ if (v) ; }
+
 #define COMMENT_ROBODOC \
     "Generated with ROBODoc Version " VERSION " (" __DATE__ ")\n"
 #define COMMENT_COPYRIGHT\
diff -Naurp robodoc-4.99.43.orig/Source/robohdrs.c robodoc-4.99.43.new/Source/robohdrs.c
--- robodoc-4.99.43.orig/Source/robohdrs.c	2015-04-11 19:28:57.000000000 +0200
+++ robodoc-4.99.43.new/Source/robohdrs.c	2018-03-07 15:22:53.591106966 +0100
@@ -65,6 +65,8 @@ along with this program.  If not, see <h
 #include <stdlib.h>
 #include <string.h>
 
+#include "robodoc.h"
+
 
 
 #ifndef HAVE_FORK
@@ -743,8 +745,8 @@ insertHeaders( ctags_t * e, char *projec
         return;
     }
 
-    assert( ofp = fopen( dstpath, "w" ) );
-    assert( ifp = fopen( srcpath, "r" ) );
+    assert((ofp = fopen( dstpath, "w")));
+    assert((ifp = fopen( srcpath, "r")));
 
     /* include file header only if project name is defined */
     if ( project )
@@ -825,7 +827,7 @@ doCtagsExec( char *fname )
     if ( ( pid = fork(  ) ) == 0 )
     {
         close( 1 );
-        dup( fd[1] );
+        IGNORE(dup(fd[1]));
         close( fd[0] );
         if ( execlp( mybin, mybin, "-x", fname, NULL ) == -1 )
         {
@@ -841,7 +843,7 @@ doCtagsExec( char *fname )
     else
     {
         close( 0 );
-        dup( fd[0] );
+        IGNORE(dup(fd[0]));
         close( fd[1] );
 
         if ( ( incoming = fdopen( 0, "r" ) ) == NULL )
@@ -869,7 +871,7 @@ doFile( char *proj, char *fname )
 
     /* backup */
     sprintf( buf, "/bin/cp -p %s %s~", fname, fname );
-    system( buf );
+    IGNORE(system(buf));
 
     if ( parseCtagsX( doCtagsExec( fname ) ) < 1 )
     {
diff -Naurp robodoc-4.99.43.orig/Source/troff_generator.c robodoc-4.99.43.new/Source/troff_generator.c
--- robodoc-4.99.43.orig/Source/troff_generator.c	2015-04-11 19:28:57.000000000 +0200
+++ robodoc-4.99.43.new/Source/troff_generator.c	2018-03-07 15:08:37.117748486 +0100
@@ -223,7 +223,7 @@ FILE               *RB_TROFF_Generate_He
             memcpy( buf, file, len );
             sprintf( buf + len, "%s.%s%s", base, section, compress_ext );
             unlink( buf );
-            symlink( basename( manpage ), buf );
+            IGNORE(symlink(basename(manpage), buf));
             RB_Say( "+ Linked with \"%s\"\n", SAY_INFO, buf );
         }
 #else
@@ -560,6 +560,6 @@ void RB_TROFF_Generate_Item_Line_Number(
  * SOURCE
  */
 {
-    fprintf( dest_doc, line_number_string );
+    fputs(line_number_string, dest_doc);
 }
 /******/
diff -Naurp robodoc-4.99.43.orig/Source/util.c robodoc-4.99.43.new/Source/util.c
--- robodoc-4.99.43.orig/Source/util.c	2015-04-11 19:28:57.000000000 +0200
+++ robodoc-4.99.43.new/Source/util.c	2018-03-07 15:08:37.118748496 +0100
@@ -1033,7 +1033,7 @@ char               *RB_ReadWholeLine(
     {
         *buf = '\0';
         /* read next chunk */
-        fgets( buf, MAX_LINE_LEN, file );
+        IGNORE(fgets(buf, MAX_LINE_LEN, file));
         if ( ferror( file ) )
         {
             /* an error occurred */
@@ -1195,7 +1195,7 @@ void RB_Change_Back_To_CWD(
 {
     if ( cwd != NULL )
     {
-        chdir( cwd );
+        IGNORE(chdir(cwd));
         free( cwd );
         cwd = NULL;
     }
@@ -1223,14 +1223,14 @@ void RB_Change_To_Docdir(
     RB_Change_Back_To_CWD(  );
 
     /* Save CWD */
-    getcwd( tmp, sizeof( tmp ) );
+    IGNORE(getcwd(tmp, sizeof(tmp)));
     cwd = RB_StrDup( tmp );
 
     /* Get the name of doc directory and change into it */
     len = namestart - docname;
     strncpy( tmp, docname, len );
     tmp[len] = 0;
-    chdir( tmp );
+    IGNORE(chdir(tmp));
 }
 
 /*******/