Fails to build with `libxfce4ui-2`.

Ahoj,

I am trying to compile the latest version from this git repository.

But ./configure fails for me with

checking for libxfce4ui-1 >= 4.8.0... not found
*** The required package libxfce4ui-1 was not found on your system.

I have installed the package libxfce4ui, which provides, amongst others, the files

• /usr/lib/pkgconfig/libxfce4ui-2.pc
• /usr/lib/libxfce4ui-2.so
• /usr/include/xfce4/libxfce4ui-2/libxfce4ui/libxfce4ui.h together with several other .h files.

/usr/lib/pkgconfig/libxfce4ui-2.pc contains

prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: libxfce4ui
Description: Widgets library for Xfce
Requires: gtk+-3.0 libxfce4util-1.0
Version: 4.18.3
Libs: -L${libdir} -lxfce4ui-2
Cflags: -I${includedir}/xfce4/libxfce4ui-2

so it is version 4.18.3, which is definitely higher than 4.8.0.

It seems that this project here expects an outdated version of libxfce4ui (it expects the -1-variant), can you adapt to also support the newer version (the -2 variant)?

Same with libxfce4panel-1 (what this software expects) vs. libxfce4panel-2 (what current xfce4-panel ships).

Regards!