Did you use a fresh checkout ?
If you use automake-system, run "make clean" and "./bootstrap" before "./configure ...".
If you use C::B's project-files remove "src/devel", "src/output", "src/.objs " and "src/include/*.gch" to be absolutely sure nothing older remains.
When using "automake" be sure the pch's are deleted ("src/include/*.gch").