Hello, Here is (attached to this e-mail) the patch that enabled me to build the Qt3 SVN tree with only Slackware-specific patches and the libpng14 patch as supplementary patch, on my Slackware64 13.37 with Qt4 and KDE4 installed alongside, and with /opt/kde3 prefix. The patch: —adds include/ symlinks which were present in qt-3.3.8b but not in SVN. Especially, there was no symlink in include/private. —but removes the include/png.h symlink, since nobody in their right mind would use the included libpng 1.2.5, and the build system puts the internal -I before -I/usr/include, making the build fail on libpng-1.4-only systems because it uses the libpng-1.2.5 include instead of the 1.4.5 one. Let's just let the user specify the libpng include if it is nonstandard (BTW, I have some doubts regarding qt3's abilities to detect libpng, since it didn't -I/usr/include/libpng14, the latter being the include path specified in my libpng.pc). —adds a missing #include <cstdlib> in qdesktopwidget_x11.c. Did someone build the SVN version of Qt3 on distributions other than Debian/Ubuntu or Slackware ?