How to compile fvwm-2.5.16 on OpenBSD 3.8/3.9

download fvwm and apply the patch for translucent menus http://www.dd.chalmers.se/~griph/fvwm-2.5.15-translucency.diff.gz

$ cd fvwm-2.5.16
$ patch -p1 < /path/to/your/patch.diff

install pkgconfig, libpng, iconv (rplay,gettext)

run configure script:
$ ./configure --with-png-library=/usr/local/lib/ --with-png-includes=/usr/local/include/libpng/ --with-iconv-library=/usr/local/lib/ --with-iconv-includes=/usr/local/include/ --disable-bidi

copy libpng to /usr/X11R6/ (I know it's dirty)
$ cp /usr/local/lib/libpng* /usr/X11R6/lib/

run make and install
$ make
$ su -
password:
# make install

enjoy !