On Debian and Debian-based distributions such as Ubuntu, there is a compile failure:

 gcc -DHAVE_CONFIG_H -I. -I. -I../.. -I../.. -I../.. -I../.. -I../../lib/libc -I../../src/core-utils -I../../src -I../../src/gnc-module -I../../src/business/business-core/ -I../../lib/libqof/qof -DGNUCASH -pthread -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -std=gnu99 -g -O2 -Wall -Wunused -Wmissing-prototypes -Wmissing-declarations -Werror -Wdeclaration-after-statement -Wno-pointer-sign -MT engine-helpers.lo -MD -MP -MF .deps/engine-helpers.Tpo -c engine-helpers.c  -fPIC -DPIC -o .libs/engine-helpers.o
engine-helpers.c:27:24: error: g-wrap-wct.h: No such file or directory

I have g-wrap-1.9.6-2ubuntu2. The file in question has been moved to <g-wrap/guile-wct.h>. (That is, /usr/include/g-wrap/guile-wct.h.)

There exists a workaround, ( http://blog.moria.org.uk/computers/code/g-wrap ), but it may be advantageous to either require the fixed version (1.9.6-3 on Debian or Ubuntu Dapper; not yet ported to Ubuntu Breezy) or check for a workaround. For more information, see the Debian bug report:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=323462