diff --git a/a2pic.c b/a2pic.c
index 6fb3c50..5be9fda 100644
--- a/a2pic.c
+++ b/a2pic.c
@@ -1,11 +1,12 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 
 void
 usage (char *s)
 {
-	fprintf (stderr, "Usage: %s [file]\n");
+	fprintf (stderr, "Usage: %s [file]\n", s);
 }
 
 void
diff --git a/awp.c b/awp.c
index 983d9e6..3c00f63 100644
--- a/awp.c
+++ b/awp.c
@@ -123,7 +123,7 @@ process (FILE *f, char *name)
 					sub--;
 				}
 			}
-		} else if (rec[1] = 0xd0) {
+		} else if (rec[1] == 0xd0) {
 			int i;
 
 			for (i = 0; i < rec[0]; i++)
diff --git a/crypto.c b/crypto.c
index a98a6e5..b206eaf 100644
--- a/crypto.c
+++ b/crypto.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 
 char **av;
@@ -7,7 +8,7 @@ char **av;
 void
 usage (char *s)
 {
-	fprintf (stderr, "Usage: %s [file]\n");
+	fprintf (stderr, "Usage: %s [file]\n", s);
 }
 
 void
diff --git a/fp.c b/fp.c
index 5d32c1d..65e9c1a 100644
--- a/fp.c
+++ b/fp.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 
 char **av;
@@ -7,7 +8,7 @@ char **av;
 void
 usage (char *s)
 {
-	fprintf (stderr, "Usage: %s [file]\n");
+	fprintf (stderr, "Usage: %s [file]\n", s);
 }
 
 char *
diff --git a/orca.c b/orca.c
index 85136ef..0548662 100644
--- a/orca.c
+++ b/orca.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 
 char **av;
@@ -7,7 +8,7 @@ char **av;
 void
 usage (char *s)
 {
-	fprintf (stderr, "Usage: %s [file]\n");
+	fprintf (stderr, "Usage: %s [file]\n", s);
 }
 
 void
diff --git a/pack.c b/pack.c
index 49cfa0f..fe026c8 100644
--- a/pack.c
+++ b/pack.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 
 char **av;
@@ -7,7 +8,7 @@ char **av;
 void
 usage (char *s)
 {
-	fprintf (stderr, "Usage: %s [file]\n");
+	fprintf (stderr, "Usage: %s [file]\n", s);
 }
 
 void
diff --git a/ps.c b/ps.c
index c90834c..b76bb4d 100644
--- a/ps.c
+++ b/ps.c
@@ -1,11 +1,12 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 
 void
 usage (char *s)
 {
-	fprintf (stderr, "Usage: %s [file]\n");
+	fprintf (stderr, "Usage: %s [file]\n", s);
 }
 
 void
diff --git a/zb.c b/zb.c
index 676c906..0f9e5ec 100644
--- a/zb.c
+++ b/zb.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 
 char **av;
@@ -7,7 +8,7 @@ char **av;
 void
 usage (char *s)
 {
-	fprintf (stderr, "Usage: %s [file]\n");
+	fprintf (stderr, "Usage: %s [file]\n", s);
 }
 
 char *