Net/Socket.php is missing.

When installing i get the following error:
cp: /home/user/src/essentials/php-4_2_0RC3/pear/Net/Socket.php: No such file or directory

PHP is configured for apache 2.0.35 with:
./configure --with-mysql=/usr/local/mysql --with-gd=/usr/local --with-t1lib --with-jpeg-dir --with-png-dir --with-tiff-dir --with-zlib-dir --with-freetype-dir=/usr/local/include/freetype2/freetype --with-imap --with-gettext --with-zlib --with-pdflib --enable-exif --enable-ftp --enable-bcmath --with-mcrypt --with-dom --with-expat-dir=/usr/local --enable-xslt --with-xslt-sablot --enable-sablot-errors-descriptive --with-config-file-path=/usr/local/etc --with-tsrm-pth --with-apxs2=/usr/local/apache2/bin/apxs