diff --git a/configure b/configure
index c7aa3d262..f9f6ba0ce 100755
--- a/configure
+++ b/configure
@@ -3019,13 +3019,13 @@ fi
 #    Define these variables, but turn them off in main version of code
 #
 build_with_f2c=0
-if test -n $BUILD_WITH_F2C ; then
-  if test $BUILD_WITH_F2C = "y" -o $BUILD_WITH_F2C = "Y" ; then
+if test -n "$BUILD_WITH_F2C" ; then
+  if test "$BUILD_WITH_F2C" = "y" -o "$BUILD_WITH_F2C" = "Y" ; then
     build_with_f2c=1
-  elif test $BUILD_WITH_F2C = "n" -o $BUILD_WITH_F2C = "N" ; then
+  elif test "$BUILD_WITH_F2C" = "n" -o "$BUILD_WITH_F2C" = "N" ; then
     build_with_f2c=0
-  elif test $BUILD_WITH_F2C = "default" ; then
-    if test x$OS_IS_WIN = "x1" ; then
+  elif test "$BUILD_WITH_F2C" = "default" ; then
+    if test "x$OS_IS_WIN" = "x1" ; then
        build_with_f2c=1
     else
        build_with_f2c=0
diff --git a/configure.in b/configure.in
index d57d0213f..0c760fe9d 100755
--- a/configure.in
+++ b/configure.in
@@ -1060,7 +1060,7 @@ EOF
   fi
   rm -f testf90.f90
   AC_MSG_RESULT(${f90type})
-  if test -n $BUILD_F90; then
+  if test "x${BUILD_F90}" != "x0"; then
     if test "x${has_f90}" = "xno"; then
       echo "   -> cannot build the Fortran 90 interface"
       BUILD_F90=0
@@ -1237,7 +1237,6 @@ AC_OUTPUT(Makefile \
           ext/f2c_blas/Makefile \
           ext/f2c_lapack/Makefile \
           ext/f2c_math/Makefile \
-          ext/recipes/Makefile \
 	  examples/Makefile \
           examples/cxx/Makefile \
 	  tools/Makefile \