--- configure.orig	2006-09-12 19:25:45 UTC
+++ configure
@@ -3095,7 +3095,7 @@ cat >>confdefs.h <<\_ACEOF
 #define HAVE_PYTHON_H 1
 _ACEOF
 
-			let have_python+=1
+			have_python=$(($have_python+1))
 		fi
 
 		# Check for Python library path
@@ -3115,7 +3115,7 @@ echo "${ECHO_T}$python_path" >&6
 			#AC_MSG_ERROR([cannot find Python library path])
 			have_python=0
 		else
-			let have_python+=1
+			have_python=$(($have_python+1))
 
 cat >>confdefs.h <<\_ACEOF
 #define HAVE_LIBPYTHON 1