Created attachment 5949 { set -x; make clean 2>&1; ./configure --enable-compositor 2>&1; make 2>&1; set -x; } | tee success-build.log When building Xfwm4 with `./configure --disable-compositor` and then the normal sequence of steps afterward, it configures fine, but then fails during `make`. I've confirmed that it builds and runs just fine with the compositor enabled, it is --disable-compositor that trips it up. Build log of the failed build is attached.
Fixed in git now, thanks for the report!