OpenWrt / > ipkg install webif   
Installing webif (0.3-11) to root...
Downloading http://download2.berlios.de/pub/xwrt/packages/webif_0.3-11_mipsel.ipk
Installing ipkg (0.99.149-2) to root...
Downloading http://download2.berlios.de/pub/xwrt/packages/ipkg_0.99.149-2_mipsel.ipk
xsystem: ERROR: fork failed before execution: `wget --passive-ftp      -q -P /tmp/ipkg-17z0UP http://download2.berlios.de/pub/xwrt/packages/ipkg_0.99.149-2_mipsel.ipk'
Nothing to be done
An error ocurred, return value: 22.
Collected errors:
Failed to download ipkg. Perhaps you need to run 'ipkg update'?
xsystem: ERROR: fork failed before execution: `rm -fr /tmp/ipkg-17z0UP
'
WARNING: Unable to remove temporary directory: /tmp/ipkg-17z0UP: Cannot allocate memory