- # Xdefaults uses ! as comment instead of #. tmp file necessary because of
- # different implementations of `sed -i`.
- sed 's/^#/!/' Xdefaults > Xdefaults.tmp
- mv Xdefaults.tmp Xdefaults
+ # Xdefaults uses ! as comment instead of #.
+ sed_i 's/^#/!/' Xdefaults
+ # Use urxvt's pseudo-transparency if compton is not available. Better than
+ # nothing.
+ if ! installed compton; then
+ echo 'Xdefaults: no compton found, enabling pseudo-transparency'
+ sed_i 's/^Rxvt\*background/!&/' Xdefaults
+ sed_i 's/^!NO_COMPTON //' Xdefaults
+ fi