diff --git a/externals/iem/iemmatrix/src/mtx_dispersive_dline.c b/externals/iem/iemmatrix/src/mtx_dispersive_dline.c
index 9648ab47d04fedb5ecaf05fe11d50a53bb1fd2c2..84f716feed29559382098dfe4b8d149ac7737d59 100644
--- a/externals/iem/iemmatrix/src/mtx_dispersive_dline.c
+++ b/externals/iem/iemmatrix/src/mtx_dispersive_dline.c
@@ -141,7 +141,7 @@ static void mtx_dispersive_dline_resize(t_mtx_dispersive_dline *x, t_symbol *s,
    }
 }
 
-static allpass_chain_cycle (t_float x, t_float *y, t_float *z, int n, t_float a) {
+static void allpass_chain_cycle (t_float x, t_float *y, t_float *z, int n, t_float a) {
 	t_float w, in;
         int c;
 	in = y[0] = x;
diff --git a/externals/unauthorized/cooled~.c b/externals/unauthorized/cooled~.c
index 0d346346008834ecf935680468df7eb4d159dd92..87ee370b3c56b8a23ab8fd857f925571ded8fc23 100644
--- a/externals/unauthorized/cooled~.c
+++ b/externals/unauthorized/cooled~.c
@@ -171,7 +171,7 @@ static void cooled_update_block(t_cooled *x, t_glist *glist, int bnumber)
     int hi, i=0;
     t_float fspectrum=0.0;
     int phase=0;
-    char color[8];
+    char color[9];
 
     memset( x->x_gifdata, 0x0, x->x_height*x->x_zoom*sizeof("#FFFFFF ") );
 
@@ -259,7 +259,7 @@ static void cooled_erase_block(t_cooled *x, t_glist *glist, int sample )
 
             for ( i=0; i<x->x_zoom; i++ )
             {
-                strcpy( x->x_gifdata+i*sizeof("#FFFFFF "), strcat( COOLED_BGCOLOR, " ") );
+                strcat(strcpy( x->x_gifdata+i*sizeof("#FFFFFF "), COOLED_BGCOLOR), " ");
             }
             if ( glist_isvisible( x->x_glist ) )
                 SYS_VGUI5("COOLEDIMAGE%x put {%s} -to %d %d\n", x, x->x_gifdata,
diff --git a/pd/src/s_inter.c b/pd/src/s_inter.c
index d6f9f3b1ac135343b52fae61a571b39de1636262..b3aefa4e0480dc96ee285d44d9956feae2fdf78d 100644
--- a/pd/src/s_inter.c
+++ b/pd/src/s_inter.c
@@ -66,6 +66,7 @@ typedef int socklen_t;
 #include <errno.h>
 #include <string.h>
 #include <stdio.h>
+#include <ctype.h>
 
 #ifdef __APPLE__
 #include <sys/types.h>