diff --git a/base/mysql.hh b/base/mysql.hh
index 2278d42e7..ae28a9dfb 100644
--- a/base/mysql.hh
+++ b/base/mysql.hh
@@ -33,6 +33,7 @@
 
 #include <cassert>
 #include <iosfwd>
+#include <mysql_version.h>
 #include <mysql.h>
 #include <string>
 #include <sstream>
@@ -89,6 +90,8 @@ class Result
     {
         if (result)
             refcount = new int(1);
+        else
+            refcount = NULL;
     }
 
     Result(const Result &result)
diff --git a/base/pollevent.hh b/base/pollevent.hh
index 13092df2c..d39931797 100644
--- a/base/pollevent.hh
+++ b/base/pollevent.hh
@@ -34,6 +34,7 @@
 #include "sim/root.hh"
 
 class Checkpoint;
+class PollQueue;
 
 class PollEvent
 {
diff --git a/dev/ethertap.hh b/dev/ethertap.hh
index dbbada40e..069ba734f 100644
--- a/dev/ethertap.hh
+++ b/dev/ethertap.hh
@@ -42,6 +42,9 @@
 #include "base/pollevent.hh"
 #include "sim/sim_object.hh"
 
+class TapEvent;
+class TapListener;
+
 /*
  * Interface to connect a simulated ethernet device to the real world
  */
diff --git a/dev/pciconfigall.hh b/dev/pciconfigall.hh
index 072a763f9..d9e623b7e 100644
--- a/dev/pciconfigall.hh
+++ b/dev/pciconfigall.hh
@@ -43,6 +43,7 @@ static const uint32_t MAX_PCI_DEV = 32;
 static const uint32_t MAX_PCI_FUNC = 8;
 
 class PciDev;
+class MemoryController;
 
 /**
  * PCI Config Space
diff --git a/dev/tsunami_cchip.hh b/dev/tsunami_cchip.hh
index 931a0fb41..e5da3984c 100644
--- a/dev/tsunami_cchip.hh
+++ b/dev/tsunami_cchip.hh
@@ -37,6 +37,8 @@
 #include "base/range.hh"
 #include "dev/io_device.hh"
 
+class MemoryController;
+
 /**
  * Tsunami CChip CSR Emulation. This device includes all the interrupt
  * handling code for the chipset.
diff --git a/dev/tsunami_io.hh b/dev/tsunami_io.hh
index 35a417e6e..1187f5904 100644
--- a/dev/tsunami_io.hh
+++ b/dev/tsunami_io.hh
@@ -38,6 +38,8 @@
 #include "dev/tsunami.hh"
 #include "sim/eventq.hh"
 
+class MemoryController;
+
 /**
  * Tsunami I/O device is a catch all for all the south bridge stuff we care
  * to implement.
diff --git a/dev/tsunami_pchip.hh b/dev/tsunami_pchip.hh
index 63ea67b1d..8c29a9ac9 100644
--- a/dev/tsunami_pchip.hh
+++ b/dev/tsunami_pchip.hh
@@ -37,6 +37,8 @@
 #include "base/range.hh"
 #include "dev/io_device.hh"
 
+class MemoryController;
+
 /**
  * A very simple implementation of the Tsunami PCI interface chips.
  */
diff --git a/sim/param.cc b/sim/param.cc
index 396fde3ac..bc81881d3 100644
--- a/sim/param.cc
+++ b/sim/param.cc
@@ -303,8 +303,8 @@ template void Param<type>::parse(const string &);			\
 template void VectorParam<type>::parse(const string &);			\
 template void Param<type>::showValue(ostream &) const;			\
 template void VectorParam<type>::showValue(ostream &) const;		\
-void Param<type>::showType(ostream &os) const { os << typestr; }	\
-void VectorParam<type>::showType(ostream &os) const {			\
+template <> void Param<type>::showType(ostream &os) const { os << typestr; }	\
+template <> void VectorParam<type>::showType(ostream &os) const {			\
     os << "vector of " << typestr;					\
 }
 #endif