diff --git a/SConstruct b/SConstruct
index 14ef1f244..4db92b295 100644
--- a/SConstruct
+++ b/SConstruct
@@ -147,6 +147,9 @@ if os.name == 'nt':
     for key,val in env['ENV'].iteritems():
         env['ENV'][key] = str(val)
 
+if 'FRAMEWORKS' not in env:
+    env['FRAMEWORKS'] = []
+
 add_RegressionTest(env)
 
 class defaults: pass
diff --git a/include/cantera/thermo/IdealGasPhase.h b/include/cantera/thermo/IdealGasPhase.h
index 2d15b9abb..cef7143f6 100644
--- a/include/cantera/thermo/IdealGasPhase.h
+++ b/include/cantera/thermo/IdealGasPhase.h
@@ -520,10 +520,10 @@ public:
      * \f[
      * \kappa_T = -\frac{1}{v}\left(\frac{\partial v}{\partial P}\right)_T
      * \f]
-     *  For ideal gases it's equal to the negative of the inverse of the pressure
+     *  For ideal gases it's equal to the inverse of the pressure
      */
     virtual doublereal isothermalCompressibility() const {
-        return -1.0/pressure();
+        return 1.0/pressure();
     }
 
     //! Return the volumetric thermal expansion coefficient. Units: 1/K.
diff --git a/interfaces/python/ctml_writer.py b/interfaces/python/ctml_writer.py
index 3456032ec..860ffe312 100644
--- a/interfaces/python/ctml_writer.py
+++ b/interfaces/python/ctml_writer.py
@@ -1284,15 +1284,16 @@ class falloff_reaction(reaction):
         if 'M)' in self._r:
             del self._r['M)']
             del self._p['M)']
-        if 'm)' in self._r:
+        elif 'm)' in self._r:
             del self._r['m)']
             del self._p['m)']
         else:
             for r in self._r.keys():
                 if r[-1] == ')' and r.find('(') < 0:
+                    species = r[:-1]
                     if self._eff:
-                        raise CTI_Error('(+ '+mspecies+') and '+self._eff+' cannot both be specified')
-                    self._eff = r[-1]+':1.0'
+                        raise CTI_Error('(+ '+species+') and '+self._eff+' cannot both be specified')
+                    self._eff = species+':1.0'
                     self._effm = 0.0
 
                     del self._r[r]
diff --git a/src/thermo/IdealSolnGasVPSS.cpp b/src/thermo/IdealSolnGasVPSS.cpp
index 06019a3e0..254bcad70 100644
--- a/src/thermo/IdealSolnGasVPSS.cpp
+++ b/src/thermo/IdealSolnGasVPSS.cpp
@@ -202,7 +202,7 @@ void IdealSolnGasVPSS::calcDensity()
 doublereal IdealSolnGasVPSS::isothermalCompressibility() const
 {
     if (m_idealGas) {
-        return -1.0 / m_Pcurrent;
+        return 1.0 / m_Pcurrent;
     } else {
         throw CanteraError("IdealSolnGasVPSS::isothermalCompressibility() ",
                            "not implemented");
diff --git a/src/thermo/MetalSHEelectrons.cpp b/src/thermo/MetalSHEelectrons.cpp
index 9758bc3f6..951c43085 100644
--- a/src/thermo/MetalSHEelectrons.cpp
+++ b/src/thermo/MetalSHEelectrons.cpp
@@ -208,7 +208,7 @@ void MetalSHEelectrons::setPressure(doublereal p)
  */
 doublereal MetalSHEelectrons::isothermalCompressibility() const
 {
-    return -1.0/pressure();
+    return 1.0/pressure();
 }
 //====================================================================================================================
 /*