In the version of Debian Linux I am running (lenny), the included WebKit for GTK+ is version 1.0.1.  When I try to build from svn (r19201) with Webkit enabled, it fails during "make install" with the error:

cc1: warnings being treated as errors
gnc-html-webkit.c: In function ‘impl_webkit_print’:
gnc-html-webkit.c:1102: error: implicit declaration of function ‘webkit_web_frame_print’

Checking the GTK documentation (http://webkitgtk.org/reference/webkitgtk-WebKitWebFrame.html), I see that webkit_web_frame_print is labeled "Since 1.1.5".  The function webkit_web_frame_print_full is also labeled "Since 1.1.5".  So, the #if HAVE(WEBKIT_WEB_FRAME_PRINT_FULL) directive will not necessarily help.  The svn log says that this code was added because some distributions do not have webkit_web_frame_print_full, but those distributions likely also lack webkit_web_frame_print.

To reproduce:

1. Have the development package for a pre-1.1.5 version of webkit installed.
2. Get svn source
3. Run autogen.sh
4. Run ./configure --with-html-engine=webkit --enable-compile-warnings=yes (and any other options you want)
5. make && make install
6. Note the above error message (obviously, the expected result is a successful compile)