diff --git a/configure.in b/configure.in
index 905d9847c..422087b11 100644
--- a/configure.in
+++ b/configure.in
@@ -239,6 +239,7 @@ src/include/Makefile		\
 src/maths/Makefile		\
 src/maths/cmaths/Makefile	\
 src/maths/ni/Makefile		\
+src/maths/poly/Makefile		\
 src/maths/sparse/Makefile	\
 src/misc/Makefile		\
 src/parser/Makefile		\
diff --git a/src/frontend/com_let.c b/src/frontend/com_let.c
index af670b41e..e27ef0901 100644
--- a/src/frontend/com_let.c
+++ b/src/frontend/com_let.c
@@ -3,11 +3,12 @@
 #include <dvec.h>
 #include <ngspice.h>
 #include <fteext.h>
+#include <cpextern.h>
 
 #include "com_let.h"
 #include "com_display.h"
 #include "completion.h"
-#include "streams.h"
+
 
 void
 com_let(wordlist *wl)
diff --git a/src/main.c b/src/main.c
index 7365ed109..137ea78eb 100644
--- a/src/main.c
+++ b/src/main.c
@@ -270,7 +270,6 @@ main(int argc, char **argv)
 
 
     char buf[BSIZE_SP];
-    bool ciprefix();
     bool readinit = TRUE;
     bool rflag = FALSE;
     bool istty = TRUE;