diff -up gnucash-2.4.5/configure.ac.foo gnucash-2.4.5/configure.ac

--- gnucash-2.4.5/configure.ac.foo	2011-05-13 15:44:58.656686463 -0400

+++ gnucash-2.4.5/configure.ac	2011-05-13 15:46:31.353686496 -0400

@@ -393,12 +393,13 @@ fi

 GUILE_LIBS=""

 # Look up GUILE_CFLAGS and GUILE_LIBS, and version check

-PKG_CHECK_MODULES(GUILE, [guile-1.8 >= 1.8.5], , [AC_MSG_ERROR([

-

-  guile does not appear to be installed correctly, or is not in the

-  correct version range.  Perhaps you have not installed the guile

-  development packages?  Gnucash requires at least version 1.8.5 to build.

-])])

+PKG_CHECK_MODULES(GUILE, [guile-1.8 >= 1.8.5], , [

+  PKG_CHECK_MODULES(GUILE, [guile-2.0 >= 2.0.0], , [AC_MSG_ERROR([

+    guile does not appear to be installed correctly, or is not in the

+    correct version range.  Perhaps you have not installed the guile

+    development packages?  Gnucash requires at least version 1.8.5 to build.

+  ])])

+])

 # Look up GUILE executable

 AC_PATH_PROG(GUILE, guile)