diff --git a/Cantera/src/kinetics/Makefile.in b/Cantera/src/kinetics/Makefile.in
index 3e4ad8f6b..8475f435d 100644
--- a/Cantera/src/kinetics/Makefile.in
+++ b/Cantera/src/kinetics/Makefile.in
@@ -27,7 +27,7 @@ else
 endif
 
 PIC_FLAG=@PIC@
-LOCAL_DEFS = -DDEBUG_SOLVESP
+# LOCAL_DEFS = -DDEBUG_SOLVESP
 CXX_FLAGS = @CXXFLAGS@ $(LOCAL_DEFS) $(CXX_OPT) $(PIC_FLAG) $(DEBUG_FLAG)
 
 # homogeneous kinetics
diff --git a/Cantera/src/spectra/rotor.h b/Cantera/src/spectra/rotor.h
index b037b030d..0cbff62b6 100644
--- a/Cantera/src/spectra/rotor.h
+++ b/Cantera/src/spectra/rotor.h
@@ -3,6 +3,15 @@
  * Header file for class Rotor.
  */
 
+/**
+ * @defgroup spectra Spectroscopic Models
+ *
+ * These classes are used to simulate the absorption and emission spectra of 
+ * molecules.
+ *
+ * @ingroup thermoprops
+ */
+
 #ifndef CT_ROTOR
 #define CT_ROTOR
 
@@ -12,7 +21,7 @@ namespace Cantera {
 
     /**
      * Class Rotor represents a non-rigid quantum-mechanical rotor.
-     * @ingroup Spectroscopy
+     * @ingroup spectra
      */
     class Rotor {
     public:
diff --git a/preconfig b/preconfig
index 5b3711119..65d52d336 100755
--- a/preconfig
+++ b/preconfig
@@ -132,7 +132,7 @@ BUILD_F90_INTERFACE=${BUILD_F90_INTERFACE:="default"}
 # The Fortran 90/95 compiler. If set to "default", the script will
 # look for a Fortran 90/95 compiler on your system by the name of
 # "f95", "gfortran", or "g95".
-F90=${F90:="gfortran"}
+F90=${F90:="default"}
 
 # Compiler option flags for the Fortran 90/95 compiler. If you are
 # using the Absoft or the NAG compiler, additional options specific to