compile error win32 on linux

[Andrea Visinoni]

Compiling under linux with mingw after a make clean i get this error.
Seems like a path error or something like that, looking on track i can't 
find a recent modification that could cause that.
Last time i clean my environment was about a month ago.

make -C ./pidgin -f Makefile.mingw
make[1]: Entering directory `/home/andrea/pidgin-dev/src/pidgin'
make -C ../pidgin -f Makefile.mingw pidgin.dll
make[2]: Entering directory `/home/andrea/pidgin-dev/src/pidgin'
/usr/bin/i586-mingw32msvc-windres -I../libpurple -i 
win32/pidgin_dll_rc.rc -o win32/pidgin_dll_rc.o
/usr/bin/i586-mingw32msvc-windres: icon file `pixmaps/tray/16/' does not 
contain icon data
make[2]: *** [win32/pidgin_dll_rc.o] Error 1
make[2]: Leaving directory `/home/andrea/pidgin-dev/src/pidgin'
make[1]: *** [../pidgin/pidgin.dll.a] Error 2
make[1]: Leaving directory `/home/andrea/pidgin-dev/src/pidgin'
make: *** [all] Error 2