Patches
diff generation
For git users:
cd dmenu-directory
git diff > dmenu-X.Y-yourpatchname.diff
For tarballs:
cd modified-dmenu-directory/..
diff -up original-dmenu-directory modified-dmenu-directory > dmenu-X.Y-yourpatchname.diff
where X.Y is a dmenu tag name or version number.
patch application
For git users:
cd dmenu-directory
git apply path/to/patch.diff
For tarballs:
cd dmenu-directory
patch -p1 < path/to/patch.diff